"[Auth] Username and password not accepted"

[cyberzork]

Google have been for sometime no longer wanting users to use POP accounts due to security reasons with legacy user name and passwords. So you should now add your Gmail account via the automatic email wizard IMAP setup which uses a secure OAuth token. Then drag / move all your old POP mail and exiting folders / labels to your Gmail IMAP account.

Once you are confident all your POP mail has been moved to your Gmail IMAP folders / labels, then remove your POP account in eM Client.

Note: Backup eM Client via “Menu / Backup” before doing anything incase you have any problems. You can see when the backup is completed via “Menu / Operations”.

See the following eM Client support page on this.

Google ‘less secure apps’ access and what it means for eM Client

However if you do want to continue to use POP with Gmail see the following thread below where you can still currently setup an “App password with 2Step (2FA) verification” to allow it to work.

Note:- I would suggest though you change to IMAP as it’s unknown as to how long Gmail will continue supporting POP accounts via app passwords. They could cut it off anytime.

I fixed gmail pop3 authentication problems. POP3 is supported

Over the past few days emclient has been unable to pop3 into my gmail accounts. I was getting password requided errors saying Server says auth username and password not accepted. What you need to do is Create and Use App Passwords in google. Google will create a special 16 digit password that you put into emclient. You also tell google that this password is for mail. To create an app passsword you have to have 2 step verification turn on on your google account. Then create an app password in …