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This is also why it's preferable to use TLS-only ports for SMTP (465) and IMAP (993) instead of using the STARTTLS protocol extensions. Mail clients aren't requ

by jolmg 8y ago

This is also why it's preferable to use TLS-only ports for SMTP (465) and IMAP (993) instead of using the STARTTLS protocol extensions. Mail clients aren't required to enforce STARTTLS and might fallback to plain text when an MITM blocks the extension.