Dovecot, POP3 and Gmail

Posted by Eric J. on Server Fault See other posts from Server Fault or by Eric J.
Published on 2012-11-10T06:41:37Z Indexed on 2012/11/10 11:06 UTC
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I setup Postfix and Dovecot on a new Ubuntu box following these directions.

From a client machine, I validate that POP3 seems to be working

telnet mydomain.com 110
+OK Dovecot ready.
USER [email protected]
+OK
PASS mypassword
+OK Logged in.
quit
+OK Logging out.

However, when trying to configure Gmail on the same client to retrieve email via POP3, I get the error

Server denied POP3 access for the given username and password.
Server returned error: "Login failed."

I carefully confirmed that Gmail is configured to use the same POP Server, Port, Username and Password I used when checking the connection with telnet.

What could be causing Gmail to get a "Login failed" message?

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