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Posts: 60
Thanks: 5
Registered: ‎17-02-2008


I have just started encountering this outgoing email problem - has been fine up until now.
I am using Thunderbird and Avast! - both up to date - on Windows 7 Home
Some emails go via Plusnet ( and some go via my own domains SMTP depending on the email address I send from.
My domain (not hosted by PlusNet) SMTP requires authentication.
This problem only occurs when I set Avast to 'Scan outbound messages' and send emails via my domains SMTP.
Emails are rejected and I get the following (also attached):
An error occurred sending mail: The mail server sent an incorrect greeting: rblsmtpd: pid 8597: 451
I appreciate that I can just turn Avast's Scan outbound messages off but would prefer not to.
Any enlightenment welcome, thanks
Plusnet Help Team
Plusnet Help Team
Posts: 13,845
Thanks: 275
Fixes: 79
Registered: ‎27-04-2007

Re: SMTP/Avast/Spamhaus

If this only happens when using Avast then surely that must be the issue, have you tried re-installing it perhaps to see if that helps?
If this post resolved your issue please click the 'This fixed my problem' button
 Adam Walker
 Plusnet Help Team