Autor: Chris Edwards Data: A: exim-users Assumpte: Re: [Exim] Retry timeout option of "defer"
| We have a few customer-managed mail servers that we route mail for, | and some of those hosts give 4xx errors on recipients that their
| mail servers dont like for anti-spam reasons. | | They *should* be giving 5xx errors, but unfortunately their MTA
| software wont accomodate it. | | So, these messages accumulate on our queue, never to be delivered
| since we always get the 4xx until the ultimate retry timeout gets hit.
Then what happens ? You bounce the message to the counterfeited sender ?
These days, anyone giving 4xx or 5xx for antispam reasons (ie. the
customer-managed servers here) really want to be their own MX. Otherwise
yet more backscatter spam is the result...
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Chris Edwards, Glasgow University Computing Service