Re: handling spam from gmail.

On Fri, 12 Jun 2020, Andreas Born wrote:

Maybe, and I really hope so, this problem no longer exists. I will immediately reconfigure my mail system, if rejecting mails after DATA will be safe and reliable nowadays.

In particular, bots don't hang around for the DATA response.

Any MTA that ignores SMTP responses for the DATA step would also ignore common conditions like full mailbox. Such brokeness and failure to follow RFC is by itself grounds to reject the mail until the MTA software is fixed.

One blacklist operator actually uses this as a criteria for blacklisting

(Section: Tracking use of QUIT)
http://wiki.junkemailfilter.com/index.php/Spam_DNS_Lists

I issue post-DATA return codes, and I have yet, in decades of use, had problems with legitimate senders.

Joseph Tam <jtam.home@gmail.com>