Hi there. I'm running RH9 with the default imap, apache, sendmail services installed. What I'm trying to accomplish is an online webmail. Now I've got the web interface running no problem, SquirrelMail can login and even send out email. But it won't recieve email. Now I'm pretty sure that it's sendmail's responsibility for sending and recieving mail, but I don't know how to check to see if it's recieving any email. I haven't configured anything on this box, except for making the imap service start on boot. Any suggestions would be greatly appreciated, or maybe somewhere I could look to read about the details of recieving mail.

Have you got your DNS MX record pointing to your machine?

Thanks for the suggestion, I didn't even know what an MX record was! :P So I did some research and kinda got my bearings. I told the dns people that all "user@domain.com" was to be sent to the domain.com server. I hope that's correct. I was just wondering how long that change would take to come into effect, cause once I did the MX record I tried sending an email but to no avail. I was thinking that maybe it takes some time like dns records do. Oh, BTW, im using dyndns.org's custom dns service to do this all. (the one that costs money)

p.s. thanks alot for the speedy reply on that last one!

It varies depending on the provider but most static dns entries are replicated overnight as far as I know.

Take a look at your MX record using:
dig yourdomain.com mx