Resolving IP address from Domain address

I want to resolve IP address from the domain address when a user trying to login into a remote Mail server using my IMAP based mailclient.
MY IMAP based mail client will get the login ID of the user in the format username@mailserver.com. From this i have to seperate the domain address and i have to resolve that domain name into an IP address. how can i achieve this in my C-CGI programe which runs under LINUX.
sunsrigodAsked:
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bryanhConnect With a Mentor Commented:
But be aware that mailserver.com doesn't necessarily have an IP address.  Without knowing the specifics of the interface to your mail client, I don't know exactly what "username@mailserver.com" means, but it's probably just an email address, which means it's likely that "mailserver.com" is a mail exchange (MX) domain, which means it is not associated with an IP address.  And if it _is_ a host name (which means it _is_ associated with an IP address), it isn't necessarily the host that sent the email in question.
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superschlonzCommented:
have a look at gethostbyname.
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