启用 TLS 后，端口 465 是否需要暴露？

[dfriestedt]

After we enable TLS do we need to also expose port 465 too? Looks like 25 is only exposed by default.

[sebix1 (sebix)]

Mails are usually only received via Port 25, if transport-encrypted, then with STARTTLS. SMTPS (465) is deprecated.