From d9ef8c17792f4dcf4bd40b9dae5890f47e23d087 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Sun, 12 May 2019 00:25:36 +0200
Subject: [PATCH 01/16] add sendmail notify

---
 notify/sendmail.sh | 59 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 notify/sendmail.sh

diff --git a/notify/sendmail.sh b/notify/sendmail.sh
new file mode 100644
index 00000000..3964e904
--- /dev/null
+++ b/notify/sendmail.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env sh
+
+#Support sendmail
+
+#SENDMAIL_BIN="sendmail"
+#SENDMAIL_FROM="yyyy@gmail.com"
+#SENDMAIL_TO="yyyy@gmail.com"
+
+sendmail_send() {
+  _subject="$1"
+  _content="$2"
+  _statusCode="$3" #0: success, 1: error 2($RENEW_SKIP): skipped
+  _debug "_subject" "$_subject"
+  _debug "_content" "$_content"
+  _debug "_statusCode" "$_statusCode"
+
+  SENDMAIL_BIN="${SENDMAIL_BIN:-$(_readaccountconf_mutable SENDMAIL_BIN)}"
+  if [ -z "$SENDMAIL_BIN" ]; then
+    SENDMAIL_BIN="sendmail"
+    _info "The SENDMAIL_BIN is not set, so use the default value: $SENDMAIL_BIN"
+  fi
+  if ! _exists "$SENDMAIL_BIN"; then
+    _err "Please install sendmail first."
+    return 1
+  fi
+  _saveaccountconf_mutable SENDMAIL_BIN "$SENDMAIL_BIN"
+
+  SENDMAIL_FROM="${SENDMAIL_FROM:-$(_readaccountconf_mutable SENDMAIL_FROM)}"
+  if [ -z "$SENDMAIL_FROM" ]; then
+    SENDMAIL_FROM="$USER@$HOSTNAME"
+    _info "The SENDMAIL_FROM is not set, so use the default value: $SENDMAIL_FROM"
+  fi
+  _saveaccountconf_mutable SENDMAIL_FROM "$SENDMAIL_FROM"
+
+  SENDMAIL_TO="${SENDMAIL_TO:-$(_readaccountconf_mutable SENDMAIL_TO)}"
+  if [ -z "$SENDMAIL_TO" ]; then
+    SENDMAIL_TO="$(_readaccountconf ACCOUNT_EMAIL)"
+    _info "The SENDMAIL_TO is not set, so use the account email: $SENDMAIL_TO"
+  fi
+  _saveaccountconf_mutable SENDMAIL_TO "$SENDMAIL_TO"
+
+  subject="=?UTF-8?B?$(echo "$_subject" | _base64)?="
+  error=$( { echo "From: $SENDMAIL_FROM
+To: $SENDMAIL_TO
+Subject: $subject
+Content-Type: text/plain; charset=utf-8
+
+$_content
+" | "$SENDMAIL_BIN" -f "$SENDMAIL_FROM" "$SENDMAIL_TO"; } 2>&1 )
+
+  if [ $? -ne 0 ]; then
+    _debug "sendmail send error."
+    _err "$error"
+    return 1
+  fi
+
+  _debug "sendmail send success."
+  return 0
+}

From 773e1d4e059fce80bb92bd43f3c23ab5c764b2d0 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Sun, 12 May 2019 00:34:46 +0200
Subject: [PATCH 02/16] use hostname function instead of HOSTNAME env variable

---
 notify/sendmail.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/notify/sendmail.sh b/notify/sendmail.sh
index 3964e904..162b5393 100644
--- a/notify/sendmail.sh
+++ b/notify/sendmail.sh
@@ -27,7 +27,7 @@ sendmail_send() {
 
   SENDMAIL_FROM="${SENDMAIL_FROM:-$(_readaccountconf_mutable SENDMAIL_FROM)}"
   if [ -z "$SENDMAIL_FROM" ]; then
-    SENDMAIL_FROM="$USER@$HOSTNAME"
+    SENDMAIL_FROM="$USER@$(hostname -f)"
     _info "The SENDMAIL_FROM is not set, so use the default value: $SENDMAIL_FROM"
   fi
   _saveaccountconf_mutable SENDMAIL_FROM "$SENDMAIL_FROM"

From 4f0354860885807fe3c29321a4400cce0eb721e5 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Sun, 12 May 2019 00:35:47 +0200
Subject: [PATCH 03/16] typos

---
 notify/sendmail.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/notify/sendmail.sh b/notify/sendmail.sh
index 162b5393..7c253e9c 100644
--- a/notify/sendmail.sh
+++ b/notify/sendmail.sh
@@ -40,13 +40,13 @@ sendmail_send() {
   _saveaccountconf_mutable SENDMAIL_TO "$SENDMAIL_TO"
 
   subject="=?UTF-8?B?$(echo "$_subject" | _base64)?="
-  error=$( { echo "From: $SENDMAIL_FROM
+  error=$({ echo "From: $SENDMAIL_FROM
 To: $SENDMAIL_TO
 Subject: $subject
 Content-Type: text/plain; charset=utf-8
 
 $_content
-" | "$SENDMAIL_BIN" -f "$SENDMAIL_FROM" "$SENDMAIL_TO"; } 2>&1 )
+" | "$SENDMAIL_BIN" -f "$SENDMAIL_FROM" "$SENDMAIL_TO"; } 2>&1)
 
   if [ $? -ne 0 ]; then
     _debug "sendmail send error."

From f6f6d89e0683422338c55d2a6b8b3c97fe66b403 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Sun, 12 May 2019 10:41:32 +0200
Subject: [PATCH 04/16] move sendmail notify to mail notify

---
 notify/mail.sh     | 64 +++++++++++++++++++++++++++++++++++++++++++---
 notify/sendmail.sh | 59 ------------------------------------------
 2 files changed, 61 insertions(+), 62 deletions(-)
 delete mode 100644 notify/sendmail.sh

diff --git a/notify/mail.sh b/notify/mail.sh
index 3dfef0be..949e8b5c 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -1,6 +1,9 @@
 #!/usr/bin/env sh
 
-# support local mail app
+#Support local mail app
+
+#MAIL_FROM="yyyy@gmail.com"
+#MAIL_TO="yyyy@gmail.com"
 
 mail_send() {
   _subject="$1"
@@ -10,6 +13,61 @@ mail_send() {
   _debug "_content" "$_content"
   _debug "_statusCode" "$_statusCode"
 
-  _err "Not implemented yet."
-  return 1
+  if _exists "sendmail"; then
+    _MAIL_BIN="sendmail"
+  elif _exists "mail"; then
+    _MAIL_BIN="mail"
+  else
+    _err "Please install mail or sendmail first."
+    return 1
+  fi
+
+  MAIL_FROM="${MAIL_FROM:-$(_readaccountconf_mutable MAIL_FROM)}"
+  if [ -z "$MAIL_FROM" ]; then
+    MAIL_FROM="$USER@$(hostname -f)"
+    _info "The MAIL_FROM is not set, so use the default value: $MAIL_FROM"
+  fi
+  _saveaccountconf_mutable MAIL_FROM "$MAIL_FROM"
+
+  MAIL_TO="${MAIL_TO:-$(_readaccountconf_mutable MAIL_TO)}"
+  if [ -z "$MAIL_TO" ]; then
+    MAIL_TO="$(_readaccountconf ACCOUNT_EMAIL)"
+    _info "The MAIL_TO is not set, so use the account email: $MAIL_TO"
+  fi
+  _saveaccountconf_mutable MAIL_TO "$MAIL_TO"
+
+  subject="=?UTF-8?B?$(echo "$_subject" | _base64)?="
+  result=$({ _mail_body | _mail_send; } 2>&1)
+
+  if [ $? -ne 0 ]; then
+    _debug "mail send error."
+    _err "$result"
+    return 1
+  fi
+
+  _debug "mail send success."
+  return 0
+}
+
+_mail_send() {
+  case "$_MAIL_BIN" in
+    sendmail)
+      sendmail -f "$MAIL_FROM" "$MAIL_TO"
+      ;;
+    mail)
+      mail -s "$subject" -a "From:$MAIL_FROM" -a "Content-Type:text/plain; charset=utf-8" "$MAIL_TO"
+      ;;
+  esac
+}
+
+_mail_body() {
+  if [ "$_MAIL_BIN" = "sendmail" ]; then
+    echo "From: $MAIL_FROM"
+    echo "To: $MAIL_TO"
+    echo "Subject: =?UTF-8?B?$(echo "$_subject" | _base64)?="
+    echo "Content-Type: text/plain; charset=utf-8"
+    echo
+  fi
+
+  echo "$_content"
 }
diff --git a/notify/sendmail.sh b/notify/sendmail.sh
deleted file mode 100644
index 7c253e9c..00000000
--- a/notify/sendmail.sh
+++ /dev/null
@@ -1,59 +0,0 @@
-#!/usr/bin/env sh
-
-#Support sendmail
-
-#SENDMAIL_BIN="sendmail"
-#SENDMAIL_FROM="yyyy@gmail.com"
-#SENDMAIL_TO="yyyy@gmail.com"
-
-sendmail_send() {
-  _subject="$1"
-  _content="$2"
-  _statusCode="$3" #0: success, 1: error 2($RENEW_SKIP): skipped
-  _debug "_subject" "$_subject"
-  _debug "_content" "$_content"
-  _debug "_statusCode" "$_statusCode"
-
-  SENDMAIL_BIN="${SENDMAIL_BIN:-$(_readaccountconf_mutable SENDMAIL_BIN)}"
-  if [ -z "$SENDMAIL_BIN" ]; then
-    SENDMAIL_BIN="sendmail"
-    _info "The SENDMAIL_BIN is not set, so use the default value: $SENDMAIL_BIN"
-  fi
-  if ! _exists "$SENDMAIL_BIN"; then
-    _err "Please install sendmail first."
-    return 1
-  fi
-  _saveaccountconf_mutable SENDMAIL_BIN "$SENDMAIL_BIN"
-
-  SENDMAIL_FROM="${SENDMAIL_FROM:-$(_readaccountconf_mutable SENDMAIL_FROM)}"
-  if [ -z "$SENDMAIL_FROM" ]; then
-    SENDMAIL_FROM="$USER@$(hostname -f)"
-    _info "The SENDMAIL_FROM is not set, so use the default value: $SENDMAIL_FROM"
-  fi
-  _saveaccountconf_mutable SENDMAIL_FROM "$SENDMAIL_FROM"
-
-  SENDMAIL_TO="${SENDMAIL_TO:-$(_readaccountconf_mutable SENDMAIL_TO)}"
-  if [ -z "$SENDMAIL_TO" ]; then
-    SENDMAIL_TO="$(_readaccountconf ACCOUNT_EMAIL)"
-    _info "The SENDMAIL_TO is not set, so use the account email: $SENDMAIL_TO"
-  fi
-  _saveaccountconf_mutable SENDMAIL_TO "$SENDMAIL_TO"
-
-  subject="=?UTF-8?B?$(echo "$_subject" | _base64)?="
-  error=$({ echo "From: $SENDMAIL_FROM
-To: $SENDMAIL_TO
-Subject: $subject
-Content-Type: text/plain; charset=utf-8
-
-$_content
-" | "$SENDMAIL_BIN" -f "$SENDMAIL_FROM" "$SENDMAIL_TO"; } 2>&1)
-
-  if [ $? -ne 0 ]; then
-    _debug "sendmail send error."
-    _err "$error"
-    return 1
-  fi
-
-  _debug "sendmail send success."
-  return 0
-}

From a89a62071b3728e1e6ad885fe3e9441cfb0b78bd Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Sun, 12 May 2019 13:03:01 +0200
Subject: [PATCH 05/16] cleanup, lint

---
 notify/mail.sh | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index 949e8b5c..6c6ef4e2 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -18,7 +18,7 @@ mail_send() {
   elif _exists "mail"; then
     _MAIL_BIN="mail"
   else
-    _err "Please install mail or sendmail first."
+    _err "Please install sendmail or mail first."
     return 1
   fi
 
@@ -36,6 +36,7 @@ mail_send() {
   fi
   _saveaccountconf_mutable MAIL_TO "$MAIL_TO"
 
+  contenttype="text/plain; charset=utf-8"
   subject="=?UTF-8?B?$(echo "$_subject" | _base64)?="
   result=$({ _mail_body | _mail_send; } 2>&1)
 
@@ -52,10 +53,10 @@ mail_send() {
 _mail_send() {
   case "$_MAIL_BIN" in
     sendmail)
-      sendmail -f "$MAIL_FROM" "$MAIL_TO"
+      "$_MAIL_BIN" -f "$MAIL_FROM" "$MAIL_TO"
       ;;
     mail)
-      mail -s "$subject" -a "From:$MAIL_FROM" -a "Content-Type:text/plain; charset=utf-8" "$MAIL_TO"
+      "$_MAIL_BIN" -s "$subject" -a "From:$MAIL_FROM" -a "Content-Type:$contenttype" "$MAIL_TO"
       ;;
   esac
 }
@@ -64,8 +65,8 @@ _mail_body() {
   if [ "$_MAIL_BIN" = "sendmail" ]; then
     echo "From: $MAIL_FROM"
     echo "To: $MAIL_TO"
-    echo "Subject: =?UTF-8?B?$(echo "$_subject" | _base64)?="
-    echo "Content-Type: text/plain; charset=utf-8"
+    echo "Subject: $subject"
+    echo "Content-Type: $contenttype"
     echo
   fi
 

From 10801bfb255a3dd0894ca8db1694ee019fcc4018 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Sun, 12 May 2019 13:06:45 +0200
Subject: [PATCH 06/16] use mutt if installed

---
 notify/mail.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/notify/mail.sh b/notify/mail.sh
index 6c6ef4e2..cfd381fc 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -15,6 +15,8 @@ mail_send() {
 
   if _exists "sendmail"; then
     _MAIL_BIN="sendmail"
+  elif _exists "mutt"; then
+    _MAIL_BIN="mutt"
   elif _exists "mail"; then
     _MAIL_BIN="mail"
   else
@@ -55,6 +57,9 @@ _mail_send() {
     sendmail)
       "$_MAIL_BIN" -f "$MAIL_FROM" "$MAIL_TO"
       ;;
+    mutt)
+      "$_MAIL_BIN" -s "$subject" -e "my_hdr From:$MAIL_FROM" -e "my_hdr Content-Type:$contenttype" "$MAIL_TO"
+      ;;
     mail)
       "$_MAIL_BIN" -s "$subject" -a "From:$MAIL_FROM" -a "Content-Type:$contenttype" "$MAIL_TO"
       ;;

From f6ca92337b62801222ee643cfb9def25742153b9 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Sun, 12 May 2019 20:24:02 +0200
Subject: [PATCH 07/16] remove unsupported options from mail and mutt command

---
 notify/mail.sh | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index cfd381fc..cd926270 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -57,11 +57,8 @@ _mail_send() {
     sendmail)
       "$_MAIL_BIN" -f "$MAIL_FROM" "$MAIL_TO"
       ;;
-    mutt)
-      "$_MAIL_BIN" -s "$subject" -e "my_hdr From:$MAIL_FROM" -e "my_hdr Content-Type:$contenttype" "$MAIL_TO"
-      ;;
-    mail)
-      "$_MAIL_BIN" -s "$subject" -a "From:$MAIL_FROM" -a "Content-Type:$contenttype" "$MAIL_TO"
+    mutt|mail)
+      "$_MAIL_BIN" -s "$_subject" "$MAIL_TO"
       ;;
   esac
 }

From 91c09dd0a076ff4d037dc3fc65a39d799fe4e903 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Sun, 12 May 2019 20:26:31 +0200
Subject: [PATCH 08/16] ssmtp

---
 notify/mail.sh | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index cd926270..6bb7520b 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -15,12 +15,14 @@ mail_send() {
 
   if _exists "sendmail"; then
     _MAIL_BIN="sendmail"
+  elif _exists "ssmtp"; then
+    _MAIL_BIN="ssmtp"
   elif _exists "mutt"; then
     _MAIL_BIN="mutt"
   elif _exists "mail"; then
     _MAIL_BIN="mail"
   else
-    _err "Please install sendmail or mail first."
+    _err "Please install sendmail, ssmtp, mutt or mail first."
     return 1
   fi
 
@@ -57,6 +59,9 @@ _mail_send() {
     sendmail)
       "$_MAIL_BIN" -f "$MAIL_FROM" "$MAIL_TO"
       ;;
+    ssmtp)
+      "$_MAIL_BIN" "$MAIL_TO"
+      ;;
     mutt|mail)
       "$_MAIL_BIN" -s "$_subject" "$MAIL_TO"
       ;;
@@ -64,7 +69,7 @@ _mail_send() {
 }
 
 _mail_body() {
-  if [ "$_MAIL_BIN" = "sendmail" ]; then
+  if [ "$_MAIL_BIN" = "sendmail" ] || [ "$_MAIL_BIN" = "ssmtp" ]; then
     echo "From: $MAIL_FROM"
     echo "To: $MAIL_TO"
     echo "Subject: $subject"

From d180f01b458d607559d28b853a2d42af2e42063a Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Sun, 12 May 2019 22:28:37 +0200
Subject: [PATCH 09/16] typos

---
 notify/mail.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index 6bb7520b..034fc03c 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -62,7 +62,7 @@ _mail_send() {
     ssmtp)
       "$_MAIL_BIN" "$MAIL_TO"
       ;;
-    mutt|mail)
+    mutt | mail)
       "$_MAIL_BIN" -s "$_subject" "$MAIL_TO"
       ;;
   esac

From d509ef7581789697164a38e2bdd5ae12617dfb7c Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Mon, 13 May 2019 16:06:24 +0200
Subject: [PATCH 10/16] make MAIL_FROM not required

---
 notify/mail.sh | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index 034fc03c..33ed8fe9 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -27,11 +27,14 @@ mail_send() {
   fi
 
   MAIL_FROM="${MAIL_FROM:-$(_readaccountconf_mutable MAIL_FROM)}"
-  if [ -z "$MAIL_FROM" ]; then
-    MAIL_FROM="$USER@$(hostname -f)"
-    _info "The MAIL_FROM is not set, so use the default value: $MAIL_FROM"
+  if [ -n "$MAIL_FROM" ]; then
+    if ! _contains "$MAIL_FROM" "@"; then
+      _err "It seems that the MAIL_FROM=$MAIL_FROM is not a valid email address."
+      return 1
+    fi
+
+    _saveaccountconf_mutable MAIL_FROM "$MAIL_FROM"
   fi
-  _saveaccountconf_mutable MAIL_FROM "$MAIL_FROM"
 
   MAIL_TO="${MAIL_TO:-$(_readaccountconf_mutable MAIL_TO)}"
   if [ -z "$MAIL_TO" ]; then
@@ -57,7 +60,11 @@ mail_send() {
 _mail_send() {
   case "$_MAIL_BIN" in
     sendmail)
-      "$_MAIL_BIN" -f "$MAIL_FROM" "$MAIL_TO"
+      if [ -n "$MAIL_FROM" ]; then
+        "$_MAIL_BIN" -f "$MAIL_FROM" "$MAIL_TO"
+      else
+        "$_MAIL_BIN" "$MAIL_TO"
+      fi
       ;;
     ssmtp)
       "$_MAIL_BIN" "$MAIL_TO"
@@ -70,7 +77,10 @@ _mail_send() {
 
 _mail_body() {
   if [ "$_MAIL_BIN" = "sendmail" ] || [ "$_MAIL_BIN" = "ssmtp" ]; then
-    echo "From: $MAIL_FROM"
+    if [ -n "$MAIL_FROM" ]; then
+      echo "From: $MAIL_FROM"
+    fi
+
     echo "To: $MAIL_TO"
     echo "Subject: $subject"
     echo "Content-Type: $contenttype"

From 7b6ebc5c989350c113ee3516d47192dffaaac128 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Mon, 13 May 2019 17:42:07 +0200
Subject: [PATCH 11/16] try to use ACCOUNT_MAIL if MAIL_FROM is not set

---
 notify/mail.sh | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index 33ed8fe9..a1970c0a 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -37,11 +37,21 @@ mail_send() {
   fi
 
   MAIL_TO="${MAIL_TO:-$(_readaccountconf_mutable MAIL_TO)}"
-  if [ -z "$MAIL_TO" ]; then
+  if [ -n "$MAIL_TO" ]; then
+    if ! _contains "$MAIL_TO" "@"; then
+      _err "It seems that the MAIL_TO=$MAIL_TO is not a valid email address."
+      return 1
+    fi
+
+    _saveaccountconf_mutable MAIL_TO "$MAIL_TO"
+  else
     MAIL_TO="$(_readaccountconf ACCOUNT_EMAIL)"
-    _info "The MAIL_TO is not set, so use the account email: $MAIL_TO"
+
+    if [ -z "$MAIL_TO" ]; then
+      _err "It seems that account email is empty."
+      return 1
+    fi
   fi
-  _saveaccountconf_mutable MAIL_TO "$MAIL_TO"
 
   contenttype="text/plain; charset=utf-8"
   subject="=?UTF-8?B?$(echo "$_subject" | _base64)?="

From e3052c8c57279f5732d849e63530efba90cd5af6 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Mon, 13 May 2019 17:44:04 +0200
Subject: [PATCH 12/16] expose MAIL_BIN variable

---
 notify/mail.sh | 54 +++++++++++++++++++++++++++++++++++---------------
 1 file changed, 38 insertions(+), 16 deletions(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index a1970c0a..44148d99 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -2,6 +2,7 @@
 
 #Support local mail app
 
+#MAIL_BIN="sendmail"
 #MAIL_FROM="yyyy@gmail.com"
 #MAIL_TO="yyyy@gmail.com"
 
@@ -13,18 +14,18 @@ mail_send() {
   _debug "_content" "$_content"
   _debug "_statusCode" "$_statusCode"
 
-  if _exists "sendmail"; then
-    _MAIL_BIN="sendmail"
-  elif _exists "ssmtp"; then
-    _MAIL_BIN="ssmtp"
-  elif _exists "mutt"; then
-    _MAIL_BIN="mutt"
-  elif _exists "mail"; then
-    _MAIL_BIN="mail"
-  else
-    _err "Please install sendmail, ssmtp, mutt or mail first."
+  unset -f _MAIL_BIN _MAIL_BODY _MAIL_CMD
+
+  MAIL_BIN="${MAIL_BIN:-$(_readaccountconf_mutable MAIL_BIN)}"
+  if [ -n "$MAIL_BIN" ] && ! _exists "$MAIL_BIN"; then
+    _err "It seems that the command $MAIL_BIN is not in path."
     return 1
   fi
+  _MAIL_CMD=$(_mail_cmnd)
+  if [ -n "$MAIL_BIN" ]; then
+    _saveaccountconf_mutable MAIL_BIN "$MAIL_BIN"
+  fi
+  _MAIL_BODY=$(_mail_body)
 
   MAIL_FROM="${MAIL_FROM:-$(_readaccountconf_mutable MAIL_FROM)}"
   if [ -n "$MAIL_FROM" ]; then
@@ -47,6 +48,8 @@ mail_send() {
   else
     MAIL_TO="$(_readaccountconf ACCOUNT_EMAIL)"
 
+    echo "MAIL_TO: $MAIL_TO"
+
     if [ -z "$MAIL_TO" ]; then
       _err "It seems that account email is empty."
       return 1
@@ -55,7 +58,7 @@ mail_send() {
 
   contenttype="text/plain; charset=utf-8"
   subject="=?UTF-8?B?$(echo "$_subject" | _base64)?="
-  result=$({ _mail_body | _mail_send; } 2>&1)
+  result=$({ echo "$_MAIL_BODY" | eval "$_MAIL_CMD"; } 2>&1)
 
   if [ $? -ne 0 ]; then
     _debug "mail send error."
@@ -67,20 +70,39 @@ mail_send() {
   return 0
 }
 
-_mail_send() {
+_mail_cmnd() {
+  if [ -n "$MAIL_BIN" ]; then
+    _MAIL_BIN=$(basename "$MAIL_BIN")
+  elif _exists "sendmail"; then
+    _MAIL_BIN="sendmail"
+  elif _exists "ssmtp"; then
+    _MAIL_BIN="ssmtp"
+  elif _exists "mutt"; then
+    _MAIL_BIN="mutt"
+  elif _exists "mail"; then
+    _MAIL_BIN="mail"
+  else
+    _err "Please install sendmail, ssmtp, mutt or mail first."
+    return 1
+  fi
+
   case "$_MAIL_BIN" in
     sendmail)
       if [ -n "$MAIL_FROM" ]; then
-        "$_MAIL_BIN" -f "$MAIL_FROM" "$MAIL_TO"
+        echo "'$_MAIL_BIN' -f '$MAIL_FROM' '$MAIL_TO'"
       else
-        "$_MAIL_BIN" "$MAIL_TO"
+        echo "'$_MAIL_BIN' '$MAIL_TO'"
       fi
       ;;
     ssmtp)
-      "$_MAIL_BIN" "$MAIL_TO"
+      echo "'$_MAIL_BIN' '$MAIL_TO'"
       ;;
     mutt | mail)
-      "$_MAIL_BIN" -s "$_subject" "$MAIL_TO"
+      echo "'$_MAIL_BIN' -s '$_subject' '$MAIL_TO'"
+      ;;
+    *)
+      _err "Command $MAIL_BIN is not supported, use sendmail, ssmtp, mutt or mail."
+      return 1
       ;;
   esac
 }

From 30f2c2bd7781149e3a51368f1be1fcebd273d78c Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Mon, 13 May 2019 18:11:44 +0200
Subject: [PATCH 13/16] prevent _MAIL_BIN modification

---
 notify/mail.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index 44148d99..3aa05366 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -72,7 +72,7 @@ mail_send() {
 
 _mail_cmnd() {
   if [ -n "$MAIL_BIN" ]; then
-    _MAIL_BIN=$(basename "$MAIL_BIN")
+    _MAIL_BIN="$MAIL_BIN"
   elif _exists "sendmail"; then
     _MAIL_BIN="sendmail"
   elif _exists "ssmtp"; then
@@ -86,7 +86,7 @@ _mail_cmnd() {
     return 1
   fi
 
-  case "$_MAIL_BIN" in
+  case $(basename "$_MAIL_BIN") in
     sendmail)
       if [ -n "$MAIL_FROM" ]; then
         echo "'$_MAIL_BIN' -f '$MAIL_FROM' '$MAIL_TO'"

From fc5e3a0aec38c9108322489dd16ff72cec8b55b6 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@cnt.cz>
Date: Mon, 13 May 2019 18:59:58 +0200
Subject: [PATCH 14/16] remove echo command

---
 notify/mail.sh | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index 3aa05366..73f180df 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -47,9 +47,6 @@ mail_send() {
     _saveaccountconf_mutable MAIL_TO "$MAIL_TO"
   else
     MAIL_TO="$(_readaccountconf ACCOUNT_EMAIL)"
-
-    echo "MAIL_TO: $MAIL_TO"
-
     if [ -z "$MAIL_TO" ]; then
       _err "It seems that account email is empty."
       return 1

From 9a7c9e8d989fb8f0cfea976fb7e5b14f1a7d4743 Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@hommer.cz>
Date: Sat, 18 May 2019 18:20:16 +0200
Subject: [PATCH 15/16] remove unset

---
 notify/mail.sh | 2 --
 1 file changed, 2 deletions(-)

diff --git a/notify/mail.sh b/notify/mail.sh
index 73f180df..5ad8e883 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -14,8 +14,6 @@ mail_send() {
   _debug "_content" "$_content"
   _debug "_statusCode" "$_statusCode"
 
-  unset -f _MAIL_BIN _MAIL_BODY _MAIL_CMD
-
   MAIL_BIN="${MAIL_BIN:-$(_readaccountconf_mutable MAIL_BIN)}"
   if [ -n "$MAIL_BIN" ] && ! _exists "$MAIL_BIN"; then
     _err "It seems that the command $MAIL_BIN is not in path."

From d83c9da8308decbdbd9cbab5b551189423c2004a Mon Sep 17 00:00:00 2001
From: Honza Hommer <honza@hommer.cz>
Date: Sat, 18 May 2019 18:21:19 +0200
Subject: [PATCH 16/16] add clearaccountconf MAIL_BIN

---
 notify/mail.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/notify/mail.sh b/notify/mail.sh
index 5ad8e883..dbecc3a5 100644
--- a/notify/mail.sh
+++ b/notify/mail.sh
@@ -22,6 +22,8 @@ mail_send() {
   _MAIL_CMD=$(_mail_cmnd)
   if [ -n "$MAIL_BIN" ]; then
     _saveaccountconf_mutable MAIL_BIN "$MAIL_BIN"
+  else
+    _clearaccountconf "MAIL_BIN"
   fi
   _MAIL_BODY=$(_mail_body)