Groups.io is a provider of email discussion group hosting that has been around a good long while ( launched in 2014 ) and serves up rather a lot of email. That gives them insight into delivery …
Read more
Let us take a moment to talk about SMTP status codes. Specifically, the kind that start with the number 4. Say you've just sent out your latest email, whether it be a newslet…
Simple Mail Transfer Protocol (SMTP) is the lingua franca used by mail servers to communicate with each other, in the process of sending and receiving email messages. Here's…
If you're trying to send email using an email server hosted on an IP address not expected to be running a mail server, your attempts to send mail to Gmail users is likely to…
Deliverability folks from a few different email sending platforms have mentioned seeing a new bounce from Comcast, in response when trying to mail certain comcast.net subscribers…
If you want to learn more about SMTP response codes and error messages, here's a couple of resources you'll want to check out and bookmark for future reference. First, he…
Need a fake SMTP server for testing? Chadwan Pawar of PostBox Services suggests Mailhog . It's an open source SMTP server that captures all mail and gives you a visual dashbo…
Over on the Mailop list, a postmaster shared his tale of woe involving sending mail to a small set of recipients whose mail server is behind a Cisco PIX firewall. You can tell i…
