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I would not keep an open relay even if it co-operates with spammer databases.
There is always a chance that a spammer not being in the database happens to send some hundred thousand letters via your relay.
Then you could easily find yourself blacklisted on the internet.
But can you distribute security certificates to your users?
If so, then you could setup your server to only allow relaying for those who have the certificate.
Yes, I think that I may have mis-interpreted the original post; my advice was based on varunbihani's mail server receiving a lot of spam - not that it was configured as an 'open relay' and RELAYING as opposed to just RECEIVING. [A relay is when the server sends the mail out again to somewhere else, rather than the user having to pick their mail up from that server.]
If sendmail came as part of a distribution, I would imagine the security to be set up fairly well without having to touch anything. If, however, varunbihani has compiled Sendmail from source, it is possible that the problem is RELAYING not RECEIVING. If this really is the problem, there is information from mail-abuse.org:
You did not answer my question: are you in the position to distribute security certificates to your clients?
If so, there is a greate article at this forum, showing how to setup a secure smtps server (and more): http://www.linuxquestions.org/questi...ticle&artid=50
The greatest thing with that setup is that it uses stunnel. Once you configured stunnel correctly for one secure service, you can configure other secure services (pop3s, https, etc.) in one minute: just start a new stunnel daemon for the new service with the corresponding port pairs.