The Definitive Guide to Email Deliverability

This is a beast of a piece. It might be one of the few times that “Definitive Guide” actually means The Definitive Guide. You’re gonna want to go ahead and bookmark this thing right now.
Let’s get right into it.
Email deliverability is a huge deal. Even if you’re following email best practices, your company emails might be landing in the Promotions folder, the Other folder, or even the Spam folder. If you’ve really screwed up, your emails might even be blacklisted by certain domains.
Sooo…how do you make sure your emails are getting into your subscribers’ inboxes? Glad you asked ’cause SendX has the answers.
Let’s start by talking about SPAM.
Spam filters always err on the side of Spam. So if you’re just starting to send emails from your new IP address, they’re gonna land in spam until the filters trust you. That’s why using email sending software is crucial.
But even using MailChimp, or other software, isn’t a guarantee of success. Here are a few things that can really hurt your deliverability:
- A high number of bounces. This usually indicates that you bought a list or are using a really out of date list.
- SPAM complaints. Even if 0.3% of your subscribers are reporting you as spam, you’re done.
- Subscriber Engagement. Gmail and other mailbox providers carefully watch how people engage with your emails. Consistently low open rates and low click rates mean you’re more likely to land in spam. That’s why you gotta prune your list regularly. Get rid of unengaged subscribers.
Beyond that, your email content can really hurt deliverability. Make sure that:
- Your emails aren’t just single large images.
- Your HTML markup is free of syntax errors.
- You’re sending plain-text versions of your emails.
- Your emails are optimized for mobile
- You’re not using URL shorteners for any links. None.
- You’re using different sender email addresses based on the type of email.
We’ve truly barely scratched the surface on this topic. Dive in to learn a TON more, like why you gotta authenticate your emails.
Mike Rowe…Goes Deep

Mike Rowe has a buttery smooth voice made for TV and radio. Seriously, we could listen to the guy talk about anything.
Well today, we’re putting that to the test as Mike Rowe talks us through his prostate exam.
Yup, this is really happening. Mike teamed up with Zero Cancer, an organization committed to ending prostate cancer. Together, they filmed a simple PSA that features Mike…getting a prostate exam.
During his exam, Mike talks about the importance of getting checked regularly. Not gonna lie, this ad was way less awkward and we paid way more attention than we expected.
And don’t worry, this one is surprisingly safe for work.
“As marketers, we should be changing the mantra from ‘always be closing’ to ‘always be helping’.”
Ads from the Past

This 1971 Pepsi ad is honestly just…. meh.




