The SMTPS protocol uses port 465, not 587. Port 587 is instead used for STARTTLS.
Helps getting administrators stuck in cryptic errors such as:
Failed to send a testing email to "user@mydomain.com": could not initiate SMTP session: tls: first record does not look like a TLS handshake
Reviewed-on: https://gitea.com/gitea/docs/pulls/295
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: kairosys-dev <me@arch-on.top>
Co-committed-by: kairosys-dev <me@arch-on.top>
