Fun fact for anyone who gives a shit:

For standard mail access and transmission, ports 25 (SMTP, sending) and 143 (IMAP, receiving) have been largely replaced by 587/465 and 993 respectively to facilitate SSL/TLS encryption. In some cases IMAP is absent from primary use and may be disabled by default (Microsoft, where Exchange services are primary, and Google, where MAPI is heavily utilized), but are still available for compatibility purposes.

Some legacy services still utilize 25 for sending alerts, but most everything recent allows for SMTPS for mail-enabled services.

The more you know (cue the rainbow ->🌈)