:587
(TCP)
Low Risk
SMTP Submission
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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.