The Most Common Email Typos, From 1.47 Million Real Addresses

Every email list has them: addresses that were never going to work because someone fat-fingered the domain. gamil.com instead of gmail.com. hotmial for hotmail. A missing letter, a transposed pair, .con where .com should be. We were curious how common these really are, so we looked at the domains across 1.47 million real email addresses in our reputation data and counted the misspellings.

The short version: typos are everywhere, they cluster tightly around the big mailbox providers, and the most damaging ones are not the addresses that bounce. They are the ones that quietly accept your mail and deliver it to nobody.

The most common email typos

Here are the misspellings that showed up most often, grouped by the provider people were actually aiming for.

Across just the few dozen most common domains, more than 10,000 addresses were sent to an unmistakable misspelling of Gmail, iCloud, or Hotmail. Gmail alone attracts a remarkable variety — we counted more than a dozen distinct ways to get it wrong, from dropped letters (gmal.com, gail.com) to wrong endings (gmail.cm, gmail.cim) to swapped pairs (gmial.com).

The dangerous typos are the ones that don't bounce

It is tempting to assume a typo'd address is harmless because it will simply bounce. Some do. gmail.co — Gmail without the trailing m — came back as a hard bounce more than 40% of the time in our data. A hard bounce is annoying, but it is honest: you get an error, you learn the address is dead, you remove it.

The quiet danger is the typo that doesn't bounce. Take gmil.com — Gmail missing an a. It appeared 1,918 times, and not one of those messages came back as a hard bounce. Every one was accepted. A domain that accepts mail for an address its owner never typed is either a parked catch-all or a lookalike registered to scoop up misdirected mail. Either way the outcome is the same: your message was "delivered," your deliverability dashboard stays green, and the customer you were trying to reach got nothing. There is no error to act on, so the bad address lives on your list forever.

This is exactly why a bounce rate on its own is a misleading measure of list quality. The bounces are the typos that were kind enough to tell you. The silent ones are still in there.

When typos do bounce, they bounce for good

When a misspelled domain does fail, it almost always fails permanently. Across all the bounce events in our data, roughly four out of five (about 80%) were hard bounces — permanent failures — rather than temporary soft bounces. That makes sense: a domain that does not exist, or has no mail server, will never start accepting your mail no matter how many times you retry. There is nothing to wait for. The address simply needs to come off the list.

How to catch typos before they cost you

You cannot fix a typo after the customer has left your signup form, so the highest-leverage place to catch one is the moment it is typed. A few practical defenses:

• Suggest the correction at the point of entry. When someone types gamil.com, a "did you mean gmail.com?" prompt recovers the address while the person is still on the page. BounceShift returns a suggested correction for exactly this reason.
• Verify — don't just watch bounces. Because the worst typos never bounce, you cannot rely on bounce reports to find them. Real verification checks whether a domain can actually receive mail and flags lookalikes before you send. Try it on a single address with our free email verifier.
• Clean the back catalog. The silent typos already on your list will not surface on their own. Cleaning your list sweeps them out in a single pass.

None of this requires guessing. A typo is one of the very few email problems that is unambiguous — gamil.com is not a mail provider, and no amount of optimism will make it deliver. Catching it is the cheapest deliverability win there is, and it is one of the reasons we are careful to measure accuracy honestly rather than count a "delivered" to a lookalike domain as a success.