Can't login to mail server

Hello everyone,
I'm trying to access the mail server through squirrelmail and through the Mail application. I turned on IMAP and POP access, set up squirrelmail according to the instructions, and set up an account with mail services enabled. However, when I go to the squirrelmail login page and try to login, it gives me "Unknown user or password incorrect." When I look at the mail logs on the server, it says something like "User postmaster attempted to login but failed. User has account on server". I made sure the password was right and I used the full name and the shortname but no luck. Same thing when using a client, it says the name/password is incorrect. Did I configure something incorrectly? Any help appreciated!
Thanks!

IMAP and POP are protocols. Authentication methods are plain, login, cram-md5, kerberos, etc.
You must make sure your client is set to use an authentication method supported by your server.
If you are unsure about what you have enabled, post the unmodified output of postconf -n
Also check /var/log/mailaccess.log for information on why your client gets rejected.

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