TCP
SMTP Submission
What port 587 is used for
Standard port for client mail submission via SMTP+STARTTLS.
Security considerations
Require authentication and STARTTLS.
Check if port 587 is open on any host:
Open Port Scanner →Standard port for client mail submission via SMTP+STARTTLS.
Require authentication and STARTTLS.
Check if port 587 is open on any host:
Open Port Scanner →