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We have a Smarter Mail (15.x and 14X) with Enterprise license, we have so many domains on our servers.
The issues is that when we block one of our users’ domain e.g. domain.com in SMTP blocking (setting>> Block type : EHlo domain , Direction : both) it just block the existing users from receiving emails but catch all accounts and also domain aliases are still receiving emails. That means if you send an email to email@example.com the message will be rejected but if you send email to a none existing address such as firstname.lastname@example.org it would be received by the catch all address. some of our clients are using this bug to get through the SMTP blocking and forward all of their received mails to another email address. So, we still have incoming and outgoing emails for blocked domains.
Please check this issue and tell us how we can fix this importantbug.
Thanks for your soon reply