Hi there,
I read something this week that made me paranoid about every email I've ever sent.
It was about a company called Bouncer – they help businesses manage email lists and protect their sender reputation. During their busiest season, their revenue mysteriously flatlined. They couldn't figure out why until the CEO sent himself a test email.
It landed in his spam folder.
When they dug into the data, they discovered that thousands of their marketing emails had been going to spam for months and they had no idea.
If this can happen to an email verification company, it can happen to anyone.
And it IS happening. According to research, one in six legitimate marketing emails never makes it to inboxes. In the US alone, undelivered emails might account for $60 billion in potential losses each year.
Keep your email types separate
One of Bouncer's first fixes was creating separate subdomains for marketing, transactional, and corporate emails. That way, spam issues in one communication channel couldn't cascade to others.
This is a smart move that many sites aren't doing.
If you're sending both marketing emails and transactional emails, and they're not isolated from each other, you're taking a risk. All it takes is one marketing campaign that triggers spam filters, and suddenly your order confirmations might be affected too.
If you're using WP Mail SMTP Pro, you can set this up with Smart Routing. It lets you send different types of emails through different providers automatically.
For example:
Send WooCommerce order confirmations through a reliable transactional provider like SendLayer (which sends from a subdomain for exactly this reason)
Route your newsletter through your marketing platform
Keep contact form submissions separate
Your critical transactional emails stay protected, even if something goes wrong with your marketing sends.
Want more tips on how to avoid spam jail?
1. Check your authentication records
SPF, DKIM, and DMARC prove your emails are legitimate. Gmail, Yahoo, and Outlook now require these for bulk senders. Test your setup here.
2. Monitor your email logs
The only way to know if emails are failing is to actually look. Email logs show you which emails sent successfully and which ones bounced.
3. Pay attention to engagement
Spam filters care more about whether people open your emails than your subject line. If people aren't engaging, algorithms notice.
4. Keep your sending consistent
Sudden spikes in email volume can trigger spam filters. Bouncer's problem started when they ramped up sending after a quiet summer.
5. Use a professional transactional email provider
Services like SendLayer are designed specifically for transactional emails and have the infrastructure to keep your important emails out of spam.
The truth is, even when you follow all the rules, you can still end up in spam. Email providers are constantly adjusting their algorithms, and sometimes legitimate senders get caught in the crossfire.
But you can't fix a problem you don't know exists.
It took Bouncer nearly a year to fully recover. They had to cut their subscriber list almost in half and completely rework their sending strategy. By Black Friday 2025, they'd turned things around – but they lost an entire holiday season figuring it out.
Don't let your transactional emails pay the price for your marketing experiments.
Set up Smart Routing now
Talk soon,
Rachel
Product Educator, WP Mail SMTP
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