postfix-users October 2010 archive
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postfix-users: Re: postqueue -p && postsuper ageout, tra

Re: postqueue -p && postsuper ageout, transfer, ...

From: Rok Potočnik <r_at_nospam>
Date: Wed Oct 27 2010 - 05:33:39 GMT
To: postfix-users@postfix.org

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