To fix this issue, ensure that the POP3 settings on your Gmail account are as follow. First, enter your full name and your complete email address. Next, enter your Gmail password to fix Gmail authentication error POP3. Under the Incoming mail server name, enter ‘pop.gmail.com’ and under the encrypted connection, select Yes, SSL. The SSL Port number for your account should be 995. The outgoing mail server name should smtp.gmail.com.

#gmail authentication error pop3