Can't find the password for my macmail [View all]

.... only the dots. Any way to find out?
It's not on the Keychain.
Are they stored somewhere? I have an extensive list of passwords on an encrypted file, but that Mail account is so old that the password got overlooked.

My Mail program at xfinity must have been hijacked and stuff bounces off the macmail application saying it can't send because it can't find an address I have never seen before.

I now speak fluent Filipino and Hindi... to no avail.