Catch Bad Email Addresses Before You Send: Valid, Invalid, and Duplicate Counts

You’ve built your campaign, written the perfect message, and you’re ready to hit send. But are you sure every address on your list is actually good? One missing letter, a stray space, or the same person listed twice, and suddenly you’re dealing with bounced emails and a few annoyed people who got two copies of the same message.

MailMergic now gives you a clear safety check before you send. Right under your recipient list, you’ll see exactly how many addresses are valid, how many look wrong, and how many are duplicates, so you can fix problems first, not find out about them later.

How it works

When you put together an email campaign, MailMergic looks over your recipient list and shows a simple summary line right beneath it. At a glance you can see three numbers:

• Valid: addresses that look good and are ready to go
• Invalid: addresses with a problem, like a typo, a missing @, or a broken domain
• Duplicate: the same address that appears more than once on your list

And here’s the helpful part: each count is clickable. Tap “invalid” or “duplicate” and the exact addresses expand right there, so you can see precisely what needs fixing. No hunting through a long spreadsheet, no scrolling back and forth, no guesswork. You just read the list, make your corrections, and move on.

The best part is that none of this asks anything extra of you. There’s no setting to turn on and nothing new to learn. The summary simply appears as you work, quietly keeping an eye on things in the background.

Where it helps

This little summary saves you headaches in all sorts of everyday situations:

• A teacher emailing report cards: catch the parent address that got typed as “gmial.com” before it bounces
• A nonprofit sending a newsletter: spot the supporter who ended up on the list twice and avoid sending them two copies
• An HR team sending offer letters: make sure every address is clean before anything important goes out

Anytime your list comes from a spreadsheet, a sign-up form, or a few sources stitched together, small mistakes sneak in. A name pasted into the wrong column, or a contact added by two different people. It happens to everyone. Now those slip-ups are easy to spot before they cause trouble.

One more check at the end

The same at-a-glance summary shows up again on the final send screen. So even if you skimmed past it earlier, you get one last reminder right before your emails go out, a gentle nudge to fix anything you might have missed.

It’s a small thing that makes a big difference: fewer bounced emails, no accidental duplicates, and a lot more peace of mind.

Start a campaign, glance at your recipient summary, and send with confidence.