Subdomains are “sub entries” under your domain name. Sometimes they’re more accurately called hostnames or FQDNs (“fully qualified domain names”) but for simplicity's sake, I’m mostly just g…
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This is a question that I get asked often: If somebody sends an email message that is 100% images, does that design choice itself make the message more likely to get relegated to…
Jennifer Nespola Lantz's recent post about Gmail potentially offering political senders a fast pass method to the inbox has gotten me thinking about the spam fight we went …
Let's compare B2C versus B2B deliverability issues, shall we? In the B2C (business-to-consumer) or DTC (direct-to-consumer) email marketing universe, the number of mailbox pr…
Okay, they're not really opens. They're proxy-based, false positive pre-loaded opens. Don't think of them as opens. Think of them as something you want to get out of …
(Here's an updated version of a post from way back in 2018, with additional resources! I hope you find it handy.) Need a tool to parse message headers? Trying to break down h…
Did you know? Google has a " Sender Contact Form " for Gmail, previously known as the bulk sender contact form. What is it? It's a way for you to ask Google to rec…
Microsoft's SNDS (Smart Network Data Service) portal is a free and valuable deliverability resource for senders, providing direct data and feedback regarding your sending rep…
Here's a question I get asked from time to time: What does THIS Gmail SMTP delivery temp failure error actually mean? Here's the error in question: 450, "4.2.1"…
How do I keep my email messages out of Gmail's Promotional tab? This is a common question lately. Is there one common answer? Ask six different people, and you'll get six…
