What is typo or malformed address capture?
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Typo capture happens when someone makes a small mistake typing their email address at signup and your form accepts it without checking whether the address is real.
The most common patterns: transposing characters in the domain (gmal.com, yahooo.com, outlok.com), missing the period before a TLD (captain@tidalmailio instead of captain@tidalmail.io), or forgetting the top-level domain entirely (captain@tidalmail). In each case, your ESP will attempt delivery, receive a hard bounce, and record it against your sending domain.
Some of these typo domains are benign: they simply do not exist, the bounce is immediate, and you can suppress the address. Others are more problematic. Typosquatting domains like gmal.com are registered specifically to catch common Gmail typos. Some of these are monitored as spam traps by anti-abuse organizations. Repeatedly sending to a typosquatting domain can trigger a blocklist listing.
The fix is address validation at the point of capture. A real-time validation tool can check whether the domain has valid MX records and flag obvious typos before the address enters your database. Some tools offer a "did you mean?" suggestion for common domain typos: "Did you mean captain@gmail.com?"
Double opt-in is the second line of defense. A mistyped address cannot confirm the opt-in email it never receives. The cost is a lower signup completion rate. The benefit is a list with meaningfully fewer bad addresses.
For the broader context on how bad data enters email lists, how fake names and domains get into databases covers bot activity and deliberate fakes alongside typo capture. And our done-for-you Review My Emails list cleaning identifies malformed and typo addresses in existing lists.
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