Error occurs while sending mail & e-mail is lost
An error occurred while sending mail : The mail serνer sent an incorrect greeting: concurrent connection limit in Aνast exceeded (pass:0, processes: thunderbird.exe[50]).
A previous update claimed to have addressed this but it's still there...
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It's generally recommended to disable any antivirus program option for scanning outgoing mail or secure (SSL) connections.
http://kb.mozillazine.org/Antivirus_software
Do this for Avast and see if the error remains:
https://help.avast.com/en/av_free/17/settings_sh_mail_basic.html