Strange behavior with backup mail notifications

I've tried to configure postfix, but now I also tuned in for 5 minutes. No need to use something alternative.
 
Yes, same problem here - I will switch to Postfix on my next installation of PVE. Having said that, it would be nice to fix the double email with ssmtp bug but honesty, life is too short and I've got used to it now :-)
 
For PVE VERSION 5.4 I'm using ssmtp and it worked for me by editing the file /usr/share/perl5/PVE/Tools.pm
Original line - open (MAIL, "|-", "sendmail", "-B", "8BITMIME", "-f", $mailfrom, @$mailto) ||
Corrected line - open (MAIL, "|-", "sendmail", "-B 8BITMIME", "-f", $mailfrom, @$mailto) ||

Regards
 
Using version 8.4.1 and had issues with postfix as well as the GUI notifications not working so I tried this option. It works, but like others, I also get that strange email saying

Address not found

[td] Your message wasn't delivered to 8BITMIME@mydomain because the domain mydomain couldn't be found. Check for typos or unnecessary spaces and try again. [/td]
 
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