In this blog post category, we cover factors affecting email deliverability.
If you have read other email personalization guides before, you already know the standard advice: add the subscriber’s first name to the subject line, segment your list, use dynamic content, and watch your engagement improve. That advice is not wrong. It is just incomplete. What most guides skip is the part that determines whether any … Read more
The pitch is always the same. You need contacts. You need them quickly. And somewhere online, a vendor is offering you 50,000 verified, targeted email addresses for less than the cost of a single ad campaign. It sounds like a shortcut to growth. For businesses under pressure to scale their email marketing, understanding why buying … Read more
If you are sending the same email to every person on your list, you are not running an email marketing programme. You are running a broadcast. The distinction matters because your subscribers are not a single audience. They are a collection of people at different stages, with different needs, different buying histories, and different reasons … Read more
Your campaign left the send queue. The dashboard shows it as sent. But replies have not come in, open rates have collapsed, or a subscriber has messaged to say your email never arrived. When emails are not delivered, the most frustrating part is not the lost reach. It is not knowing which of several completely … Read more
If you have set up your sending tools, written your emails carefully, and followed the standard advice, yet your campaigns are still landing in the junk folder, the problem is almost certainly not what you fixed. It is what you fixed first. Email deliverability responds to improvements in a specific order. Authentication has to be … Read more
When a new domain sends its first email, inbox providers like Gmail, Outlook, and Yahoo face a simple problem: they have no data on you. No sending history. No engagement record. No signals that tell them whether you are a legitimate business communicating with people who want to hear from you, or a spammer who … Read more
There is a particular kind of deliverability problem that is harder to diagnose than most. Your campaign goes out, engagement drops sharply, bounce rates spike, and when you look at the bounce message text, you see something like “550 5.7.1 – message rejected per policy” or a reference to Spamhaus or Barracuda. Your domain or … Read more
If you send more than 5,000 emails a day to Gmail or Yahoo inboxes, your emails are now being actively checked against a set of DNS-based authentication standards before they’re allowed anywhere near the inbox. Gmail and Yahoo made this mandatory in February 2024. Microsoft followed with its own enforcement in May 2025. This is … Read more
A founder’s technical guide to the platforms that actually determine whether your emails get delivered. Your verified list is still landing in spam. We see it every month: agencies with clean data, decent copy, and reasonable targeting that cannot figure out why reply rates are declining. The answer, almost every time, is infrastructure. We run … Read more
When an email doesn’t reach its destination, your sending platform doesn’t just tell you it failed. It hands you a three-digit number – and in that number is everything you need to know about what went wrong and what to do next. The problem is that most email marketers don’t speak SMTP. They see a … Read more