On 9/21/22 14:06, Stephen Daniel wrote:
Looking at one user in particular, I see in /var/log/syslog that postfix is sending the email. There is nothing in bounce.log.
And does the postfix log indicate the mail is accepted by the users MX?
I.e. a log message with status=sent.
They are the only user who uses that particular email domain (embarqmail.com ).
Is there anything I can do to debug why they do not get the emails? Or is this up to them and their email provider?
Assuming the message is accepted by the user's MX, the user can check a spam/bulk/junk folder and if the messages aren't there, complain to their ISP about messages being silently discarded. Your log entries showing the message successfully delivered to the MX can provide evidence.
Other than that, you need to ensure that your outgoing messages are DKIM
signed, and that your outgoing MTA server has full circle DNS
<https://en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS>. It can
also possibly help for the server's domain to publish a DMARC policy
even if that is p=none
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan