Description

These two features + tests were introduced years apart but serve the same functionality, just for either Postfix or Dovecot. Merged into single test.

Original PRs:

• DOVECOT_INET_PROTOCOLS
• POSTFIX_INET_PROTOCOLS

Type of change

• Improvement (non-breaking change that does improve existing functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes