SMTP Relay Service - Ports to Use Phuong Tran October 18, 2019 22:47 Updated Follow SMTP commonly uses ports 587 and 25. Paubox's SMTP Relay Service accepts connections on either port 587 or port 25. Related articles SMTP Server Solution - Code Samples Paubox Email API & SMTP Solutions: Comparison How to Use a Secure Contact Form With Paubox Wordpress forms - sending email alerts through Paubox Encrypted Email Setup for Microsoft 365 Comments 0 comments Please sign in to leave a comment.
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