Postmark: What’s an SMTP port & how to choose the right one

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

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