Spam Resource: All Things Deliverability

Here's a simple-but-cool tool created by Faisal Misle : smtp.codes . smtp.codes is a collection of SMTP response codes returned by email servers and a guide to help you unde…

What are the factors of deliverability? There are multiple variables in the equation. Infrastructure, volume, content, spam complaints, IP reputation, engagement, domain reputati…

A Comcast friend has shared, on another forum, some information regarding best practices when sending emails to comcast.net email addresses. I'm sharing that information here…

In light of all the chatter around the new Microsoft sender requirements , I’ve started to capture and catalog the various questions I’m getting from senders as they work toward …

Hey! I’ve got an upcoming webinar that I think you might be interested in. In April, we here at Valimail released our new report: Disinformation and Malicious Email Report: Why D…

I think I'm dying a little inside, based on the thought that the song "Cannonball" by the Breeders, something I considered so unique and alternative once upon a tim…

I've seen a significant number of folks asking for help lately on various mailing lists and online forums ( like Reddit ), saying that they're now having trouble with ema…

Pilar Bower has worked hands-on with some of the most recognizable names in digital marketing, media, and technology. Before she transitioned into our specialized world of email …

What the heck is Cinco De Microsoft? Why, today is. Monday, May 5, 2025, the date when, as announced by Microsoft , non-compliant bulk email messages sent to Microsoft consumer m…

Sometimes I need a break from all this talk of new sender requirements. So, let's sprinkle in some fun as we head into the weekend, and pause to enjoy another classic Brookly…

If you're an email developer or marketer, you know how tricky it can be to get your emails to look right across all the different email clients. Enter Can I Email , an essent…

It's nearing the end of the month, and I suspect that the folks at Koli-Lõks OÜ are getting ready to post another month's worth of spam trap data. For fun, I thought I w…

By now, you've probably heard: Microsoft has officially joined the club. Following in the footsteps of Google and Yahoo, Microsoft has announced new requirements for high-vol…

It's been a light week as far as me posting things on Spam Resource. The reason for that? I've been so busy with the release of Valimail's  2025 Disinformation and Ma…

If you're launching a new domain and plan to send emails at scale, you can't just dive in and start sending a bunch of messages. At least, not if you actually want them t…