Topic: SMTP bouncing for selected IP addresses only

[Henrik Hansen]

Hi

I'm trying to setup an sme server 6 beta 3, wich is going to function as an mail bouncer for 2 other companies.

So...what i hope someone will be able to help me with is:

Block all port 25 (smtp) traffic EXCEPT when port 25 traffic comes from the 2 mentioned companies.

Best regards

Henrik

[Byte]

You will need to look into IPTABLES the someone who can help you is google, these forums and reading books.

IPTABLES has many options, so your best bet is to try it out

Byte

[Michael Smith]

You might try searching the forums for "secure smtp" or "ssmtp".  Authenticating your inbound SMTP traffic for relay will do what you want.

[Michael Smith]

Although I might be misunderstanding you ... I assumed by "bounce" you actually meant "relay."  When I think "bounce" I mean "return as undeliverable", however, and I think the latter sense is the most commonly used.

[Henrik Hansen]

Yes sir i am aware of that but i am to occupied at the moment, so if some could please post the three lines needed it would be much appreciated !

Something like
Block all tcp port 25
allow port 25 from xxx.xxx.xxx.xxx
allow port 25 from yyy.yyy.yyy.yyy

Thanks in advance

Best regards

Henrik

[Henrik Hansen]

I was here repluing the post from Byte and referring to the 3 iptables statements i will need in /etc/rc.d/rc.local