Not all that frequently, but still too often for end users, e-mails from senders with accounts at major ISP's end up RBL bounced, due to one of that major ISP's outbound mail server's ending up on a blacklist.
After looking through listings of bounced e-mails on a number of Sophos UTM's, I'm considering creating a standardized exception list of "Major ISP" domains, whose e-mails should never be bounced because they're on a blacklist, to avoid this recurrent problem. The rest of my standard e-mail hurdles would remain in place, including RBL blocks for every other sender.
This would certainly cut down on the number of times I would have to explain to someone important to us, why e-mail from their good customer is all of the sudden being refused by their own UTM. Due to the dominance of large ISP's I expect that this change would cover the majority of these types of incidents.
What do any of you think of this idea?
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