Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

Folks, In the past, I remember having to open port 25 for email servers to check back and verify that in fact, an email was sent from an email server. Does this still pertain these days? If you have 10 outbound SMTP servers, should you have port 25 be open from www to them, so that external recipients can connect back on port 25?
If I remember correctly, spamassassin, had a feature to check this... however, not certain.

Thanks!

share|improve this question
    
Please do not run a mail server unless you really, really know what you're doing. The Internet thanks you in advance. –  Chris S Feb 11 '13 at 6:54

1 Answer 1

up vote 2 down vote accepted

I haven't heard of anyone doing this since maybe the 1990s. And it wasn't really a good idea even then.

To catch up on modern spam prevention techniques, see Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.