Top Deliverability’s Blog
Postmark: What’s an SMTP port & how to choose the right one
- October 25, 2021
- Posted by: Top Deliverability
- Category: ESPs Industry News Postmark

Postmark just issued another insightful write-up:
Are you in the middle of setting up an SMTP service and just encountered a port field you don’t know how to fill in? An example of a WordPress Mail SMTP setup. What goes into the SMTP port field? You are about to find out. We’ve got you covered, friends. In this blog post, we’ll take a deep dive into SMTP ports. Let’s get started. What is an SMTP port? An SMTP port is a communication endpoint that handles the transfer of email data over SMTP (Standard Mail Transfer Protocol) as it moves through a network, from one server to another. Ports play a crucial role in routing the right information to the right places. Whether you’re sending an email or browsing the web, any networked service requires two things to route communications appropriately: a domain name or internet address and a port. An IP address identifies a machine in…
More here: What’s an SMTP port & how to choose the right one
P.S. Do you need help with Postmark? check our Email Service Provider Handbook or Ask for a Consultation
Leave a Reply Cancel reply
Email Service Providers Handbook
The most comprehensive “Handbook of Email Service Providers“!
SPAMASSASSIN RULES
All SpamAssassin rules in one place, EXPLAINED!
SMTP COMMANDS
& REPLY CODES
All SMTP/ESMTP commands and reply codes in one place, EXPLAINED!
Free DNS Tool
Check the DNS records of your domain with our free DNS tool.
Deliverability Glossary
The most comprehensive Email Deliverability and Marketing Glossary!