On 26.10.2010 22:35, Victor Duchovni wrote:
ISP mail servers usually accept a large number of messages that most company's mail servers reject (e.g. only accept only email sent from the hosted domain). Unfortunately we can only limit the email till one point, after that we must somehow work around the issues...Arm's-length backup MX hosts, that don't know the target domain's recipient list and don't offer the same anti-spam defense do more harm than good. If you are an ISP that offers backup-MX services, you should work with your clients to obtain and maintain valid recipient lists, or work with the client to discontinue the backup MX service.
It's not just incoming email but outgoing as well. A lot of customers are using our smtp even thought we don't host their domain, either in the MUA directly or a smart relay on their MTA, and we also block outgoing smtp traffic (except the one to our servers) for customers with dynamically allocated IP addresses.
The thing is I *still* belive the postsuper command with some sort of 'ageout' and maybe 'transfer' funcionality would greatly improve Postfix - not just our system, but many would benefit from it.
-- LP, Rok
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