We're subscribed to a newspaper mail newsletter and we have a problem with 2 users.
These 2 users don't receive the mail even when the other members of the mailing list get it without a problem. I checked the Firewall Log (Watchguard XTM330) and there is a entry for the email entering and passing through the SMTP proxy for every user, excluding the ones that don't receive it.
After many test two weird things happened:
If the usual sender of the newsletter does a resend to one of the users who doesn't receive the email, we receive it without a problem.
If the problematic email is sended to a distribution list that includes the 2 uses that doesn't receive it, it arrives to their mailbox without a problem.
Any idea what could be causing this issue?
Thanks in advance!