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IPFYI
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587

SMTP Submission

Low Risk

TCP — Email

Port Overview

Port Number 587
Service Name SMTP Submission
Transport Protocol TCP
Category Email
Security Risk Low
Port Range Well-Known (0-1023)

What is Port 587?

Mail Message Submission (MSA). The recommended port for email clients to submit outgoing mail using STARTTLS encryption. Preferred over port 25 for client mail submission.

TCP Email Commonly Used

Security Considerations

Port 587 (SMTP Submission) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.

Recommendation: Standard security practices apply. Keep software updated and monitor access.

Related Ports — Email

25 SMTP 109 POP2 110 POP3 143 IMAP 158 PCMail Server 174 MAILQ 209 QMTP 220 IMAP3
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