Enhancement: add text/plain version in mail notification to avoid be classified as spam

[butlerfr]

Hello

For some mail providers (hotmail/office365), mails send by sonerezh are considered as spam. There is no problem with my mail configuration: I'm using SPF + DKIM with postfix.

Here is the return of spam assassin : -1.105 | MIME_HTML_ONLY | Message only has text/html MIME parts

It should be very easy to fix by adding a simple text/plain version of the mail.

the complete report of spam assassin:

-0.1        DKIM_SIGNED     Message has a DKIM or DK signature, not necessarily valid
0.1     DKIM_VALID      Message has at least one valid DKIM or DK signature
0.1     DKIM_VALID_AU       Message has a valid DKIM or DK signature from author's domain
0.1     DKIM_VALID_EF       Message has a valid DKIM or DK signature from envelope-from domain
-0.001      HTML_MESSAGE        HTML included in message
-1.105      MIME_HTML_ONLY      Message only has text/html MIME parts
0.001       SPF_PASS        SPF: sender matches SPF record