I am trying to add my email at Gmail "Send mail as:", But it always said error:
I am using lets encrypt ssl for my domain.
My server email port is open 25, 465, 587
Even i have already added my incoming email at gmail "Check mail from other accounts:", its working fine.
Only problem when i try to add "send mail as", getting error:
Authentication failed. Please check your username/password.
Server returned error: "TLS Negotiation failed, the certificate doesn't match the host. For more information, go to https://support.google.com/a/answer/2520500, code: 550"
Here is screenshot bellow:
