On 29 Sep 2020, at 13:46, J David wrote: > Hello, > > We know that a certain IP range contains no MTA's, but hosts websites > for a lot of domains that have no email service, i.e., those domains > have A records in that range but no MX records at all. > > Our Postfix server regularly receives messages over MSA where the > sender and recipient addresses are the same, and in one of those > domains. > > Because the domain has a valid A record, there's nothing wrong with > those messages that Postfix can detect, so the messages get accepted. > Then because there is no MTA running at that IP address, they sit in > the outbound queue for five days, bounce, and the bounce sits in the > outbound queue for five more days. > > Is there a way to: > A) Selectively identify a message based on the IP address of the MTA > it would be delivered to. > B) Reject such messages in the MSA connection or, at a minimum, keep > them from building up in the outbound queue?
See the entry for check_sender_a_access in the postconf(5) man page. -- Bill Cole b...@scconsult.com or billc...@apache.org (AKA @grumpybozo and many *@billmail.scconsult.com addresses) Not Currently Available For Hire
