I use Gmail as my primary e-mail application (I back up to Thunderbird via IMAP occasionally, but rarely use Thunderbird to read or send mail). I have it set up to send from a few other addresses that I own, and as far as I can tell that’s still working.
Recently I tried to set up a new ‘send-from’ address and was unable to. I couldn’t get it to authenticate, even if I used the Gmail SMTP server – although it’s possible that’s due to my own incompetence.
However if I try to edit any of my existing, working aliases they also suffer the same fate. I believe that Google may have changed the behaviour of this feature.
Am I missing something here?