Hey there,
Picture this. You inherit a WordPress site from a previous developer, an old contractor, or just past-you from a year ago. You install WP Mail SMTP, set it up properly, connect it to a solid provider, send yourself a test email. It arrives. Great. Job done.
Except a week later, emails start acting weird. Some go out fine. Some don't. The "from" address is wrong on a few. You go back into your settings, and everything looks correct. You didn't change anything. So why is your site not doing what you told it to do?
Somewhere on that site, there's a second SMTP plugin. Maybe it came bundled with a theme. Maybe a previous developer set it up and forgot to remove it. Maybe your host activated something as part of a "performance" package. Either way, it's still there, still active, and still trying to do the exact same job WP Mail SMTP is doing.
Two plugins, same job, no coordination. One of them wins, but not consistently, and not in a way you can predict just by looking at your settings screen.
This is more common than you'd think, especially on sites that have changed hands, switched hosts, or been through a few redesigns. Every layer adds another chance for something to get left behind.
The good news is it's easy to check. WP Mail SMTP actually watches for this and will show you an admin notice if it detects a known conflicting plugin.
But if you want to check manually, or if the conflict is coming from something less common, deactivate everything except WP Mail SMTP, send a test email, then turn your other plugins back on one at a time until the problem shows up again. Whichever plugin brings it back is your culprit.
Once you've found it, you don't need to uninstall it. Just deactivate it, or find its email settings and turn off whatever's making it send mail. One SMTP plugin per site is the rule. Because two things trying to control the same thing at the same time is never going to end cleanly.
This is one of several settings that sneakily break WordPress email without throwing an obvious error. I've put together a full guide of other things to look out for:
→ See the overlooked settings breaking your email
Until next time,
Rachel
Product Educator, WP Mail SMTP
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