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ravenplFlag for Poland asked on

Exchange, set outgoing source port?

Can I tell to exchange to use fixed source port(like 26) on outgoing smtp connections?
I need it to tighten firewall policy.
ExchangeMicrosoft Server OS

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ravenpl

8/22/2022 - Mon
amajidkh

Would it make a difference if i was to do a port scan see port 26 is open try telnet and a few other access methods i could probably pick up what system is installed.

Securing and exchange server is probably a better method, maybe installing a frontend and backend configuration would make it more secure. Some companies send email out bound via a third party av/as filtering company and recieve as well meaning you can block on allow as/av network on port 25 all others block.

Sorry just my 2 pence, just thinking more pain , you can change via the smtp setting in IIS i think.
ASKER
ravenpl

Please, only comments on outgoing source port. It don't have to be 26, but fixed. Or fixed small range.
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robrandon

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amajidkh

iis or virtual smtp server.
same as what robrandon
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ASKER
ravenpl

NO! It changes incoming port. Please next time read question more carefully.
ASKER
ravenpl

I'm sorry - read only the first part. Now I'm going to the second.
ASKER
ravenpl

No, the second part is also not what I want.
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robrandon

The article shows how to select the outgoing destination port.

Am I correct in saying that you want to specify the SOURCE port, but still have the destination port as 25?

amajidkh

according to the artile you can do both or either?
Issue again will be will other smtp server be able to communicate  with the server on different ports. Please explain ur question further as i think the questio n has been answered.
ASKER
ravenpl

> Am I correct in saying that you want to specify the SOURCE port, but still have the destination port as 25?
Correct! It don't have to be 26, 1026 will do as well. Even 1026-1036 range will do.
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William Peck
robrandon

I'm sorry to say, that I don't know.  I've done this with RPC via a registry edit, but I haven't found a way to do this for SMTP.
ASKER
ravenpl

Not really what I looked for, but learned something anyway.