
Not the general server URL / just the domain that you were using so far. In general this solution is based on the fact that you should use (in account settings of your Gmail) an exact server URL that is assigned to your mailbox. Of course, with changed steps, fields names, sections etc.

The below solution is specifically for GoDaddy users only, but should work on every other hosting. Is there anything that I can do? Or all the work is on server administrator side? in Gmail), as first message suggests? Or is this a server-side related problem, as second and third images shows? What is the actual cause for this error? Is this really a problem with configuration on my side (i.e. The biggest concern here for me is - why am I getting TLS-related errors ("TLS negotiation failed"), if I am attempting to connect over SSL? TLS Negotiation failed, the certificate doesn't match the host., code: 0 I tried to switch to SSL, but I am getting the same error for both SSL and TLS: In accounts settings, in Gmail, I have noticed that this particular account is the only one that I am still accessing (sending e-mails) using TLS instead of SSL (recommended by Gmail). This started to be happening today (after 2-3 years of using this account without any problems) and only when sending e-mail through this account (I have three others configured in "Send mail as" functionality and all of them are working normally). Starting this morning, while using Gmail as usual, e-mails sent through one of my accounts started to generate return-errors:
