[cobalt-users] OT: ISP's and Port 25 blocks

[Mike Smith <cobaltdude2002@xxxxxxxxx>]

Greetings list,
I'm sure that many of you are aware of have been directly affected by
various ISP's blocking port 25....
About 95% of our clients are small businesses which we allow for them
to relay through our servers (smpt=mail.their-domain-name.com). Within
the last few days, we began receiving calls from our clients that they
couldn't send email - and it took us a few hours to realize this was
due to a local ISP initiating a port 25 block for their residential
users. We contacted the ISP in question, and were told that this was
becoming the norm, regardless of the fact that they were essentially
blocking *our* clients from *our* services - the service for which our
clients are paying.
We're looking for a solution to this - obviously we need to keep port
25 active on our servers in order to receive mail from outside sources
(correct me if I'm wrong, but please don't flame).....but there must be
an alternative to this - perhaps mapping the smtp port to an unused
port?
I'm open to suggestions, and need a solution quickly.

Thanks in advance,
Mike

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