How to pull email messages without using pop3?


New Email
We need to pull e-mails from a mail server and store it in a file for future processing. I know it can be done by using pop3. But our mail server wont provide pop3 access to us.
Is there any other way to pull e-mails from an e-mail account?
Can we use SMTP relay to accomplish this? If yes, please how it can be done?

Thanks in advance