Implicit TLS (SMTPS) on port 465 - 1.2.0

New features

• Implicit TLS (SMTPS) on port 465. With --tls-mode tls, Mail2Go now dials
  port 465 using implicit TLS instead of negotiating STARTTLS on a plaintext
  connection. Port 465 expects TLS from the first byte, so this previously
  failed against implicit-TLS-only servers. Other ports (587, 25, …) are
  unchanged and continue to use STARTTLS.
• --tls-mode tls-skip honours implicit TLS on 465 as well, so servers on
  465 presenting self-signed or otherwise unverifiable certificates now work.
  Certificate verification remains fully enforced under --tls-mode tls.

Note

The port now determines how TLS is established: 465 uses implicit TLS (SMTPS),
every other port uses STARTTLS. --tls-mode none is unaffected. No working
configuration changes behavior — port 465 with tls or tls-skip simply failed
before.

What's Changed

• Support implicit TLS on port 465 by @bugacha in #12

New Contributors

• @bugacha made their first contribution in #12

Full Changelog: 1.1.9...1.2.0