My company is using Oempro to send out some emails to our clients. It looks like when we try to send emails to a large number of people, Oempro sets Mail From to be something like: bounce-[some number here]@mydomain.com. I believe that that number is based on the mailing list that we are sending our emails to. This allows Oempro to see which emails in which list are not valid.
The problem is that my postfix looks to verify that the sender actually has a mail account. I've checked some files and config but I am really confused. Is there someway to add a regular expression that tells postfix to allow things like firstname.lastname@example.org to go through? I looked at the /etc/postfix/access file but didn't really understand how to use it with regular expressions. Is this where I should be looking? Thanks!