Port 587 — SMTP Submission
The standard port for authenticated email submission from clients to a mail server.
| Port number | 587 |
|---|---|
| Service | SMTP Submission |
| Transport | TCP |
| Category |
Is port 587 safe?
Use with STARTTLS; the recommended outbound mail port.
Frequently asked questions
What is port 587 used for?
Port 587 (TCP) is the standard port for SMTP Submission. The standard port for authenticated email submission from clients to a mail server.
Is port 587 safe to open?
Use with STARTTLS; the recommended outbound mail port.
Is port 587 TCP or UDP?
Port 587 commonly uses TCP.