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 newsletter or marketing…
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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…
I am reliably informed that the SMTP Field Manual published by Postmark ( first mentioned here ) has been comprehensively updated, with lots of new information, including provid…
Wondering what different kind of bounces an ISP might give to you? Postmark put together this handy-dandy SMTP bounce example lookup tool. It's called the SMTP Field Manual …
