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SMTP transparent proxy on port 587

My ISP has blocked outgoing data on port 25, so I have to send email via port 587. However, the transparent SMTP proxy does not seem to recognize data on port 587 as SMTP packets, meaning outgoing email is never scanned or tagged (or counted in the statistics).

I've searched both in the KB and this forum, but can not find anything related. Allthough I am sure others too must have the same problem since, after all, blocking port 587 is rather common these days.

Is there a simple solution to this? Or should I perhaps suggest to developers to allow for SMTP 587 proxying (or can anyone think of a reason not to implement this)?

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0 BarryG over 17 years ago

DNAT _might_ do the trick.

Barry
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0 terjemikal over 17 years ago in reply to BarryG

DNAT _might_ do the trick.

I'm not sure I understand how you mean I can configure DNAT to help me with this. Can you elaborate, please?
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0 Wikked over 17 years ago in reply to terjemikal

> Source:External Address
>
> Service:SMTP
>
> Destination:Isp SMTP server
>
> New Destination:Isp SMTP server
>
> New service: port ###
>
Additional to the DNAT rule add a 'normal' pf rule:
External Address -> Service: Port 366 -> New Destination:ISP SMTP server, ACCEPT

Give that a try/ I've not tested it, but might work.
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0 terjemikal over 17 years ago in reply to Wikked

>Give that a try.

I would, but after I upgraded to 7.102 yesterday, all my proxies are hosed (HTTP, POP3, SMTP...), so nothing is really working at the moment[:(]
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0 terjemikal over 17 years ago in reply to Wikked

>Give that a try.

I would, but after I upgraded to 7.102 yesterday, all my proxies are hosed (HTTP, POP3, SMTP...), so nothing is really working at the moment[:(]
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0 terjemikal over 17 years ago in reply to terjemikal

I solved it by configuring SMTP Smarthost to point to my internal SMTP server (which relays to my ISPs SMTP), and specifying ASG as my SMTP server in all email clients. Not perfect, but a workaround I can live with.

Thanks anyway for the tip, BarryG and Wikked.
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0 va3mw over 17 years ago in reply to terjemikal

I'm using the Home version of Astaro, and my SMTP server is my ISP. How do I configure Astaro to log in their smtp server since it does require authetication?

I was away, but I'm pretty sure that after the last update, my wife could not send emails and could not contact my ISP's smtp server.

Thoughts?
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0 va3mw over 17 years ago in reply to va3mw

Found Smarthost, and configured my ISP's SMTP server, and things started to flow again.

I was not filtering SMTP outbound traffic before, and one of the updates broke it (7.104?).  I was pulling my hair out trying to fix this (wait, I don't have any anymore).

Log files weren't very clear on what might have been the problem.

Anyway, I turned on SMTP, killed transparent mode and then configure smarthost and starting getting outbound email to flow.

Thanks for the clues.

Mike
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