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What port does SMTP use?
TCP 25
What does SMTP stand for and what does it do?
Simple Mail Transfer Protocol — it sends email messages from one mail server to another.
Is SMTP only used between mail servers?
No — some local devices are also configured to use SMTP to send outgoing messages initially to the mail server.
Does SMTP handle receiving/reading email?
No — receiving email is handled by other protocols like POP3 or IMAP, not SMTP.