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How to send .Mac mail when SMTP is blocked
Authored by: slowe on Jan 18, '06 11:21:59AM

The alternate SMTP port described in your hint and referenced in the Apple document is a proposed standard from the IETF for mail submission. It's intended to be used by MUAs (e-mail clients) for submitting messages to MTAs (e-mail servers), and it's strongly recommended that authentication and encryption (via STARTTLS) be required. The idea is that this allows ISPs to tightly control server-to-server traffic (which will still occur over TCP port 25) while permitting client-to-server traffic (which will now occur over TCP port 587).

Note that .Mac is not unique in their use of port 587; Gmail also supports it.

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