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Port 45
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Well-known
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Service
mpm
Protocol
TCP
Status
🪦 Obsolete — no longer in active use
Description
Message Processing Module — early ARPANET-era mail relay protocol (default receive port). Superseded by SMTP.
RFC
RFC 759
—
Internet Message Protocol
Citations
IANA registry
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5000-5100
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Protocol(s)
TCP
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