A former employee, an old personal address, a name with a spelling mistake - one bad suggestion in the drop-down is annoying and, if you pick it by habit, genuinely risky. The fix removes exactly that one entry. Everything else Outlook remembers stays untouched.
You do not need settings, files or restarts for this job. Outlook has a built-in way to delete a single suggestion, and it takes less time than reading this paragraph. The rest of this page covers why the name sometimes comes back, and the heavy option you should not use for a single bad entry.
This takes ten seconds and touches nothing else:
On older Outlook versions without the X, highlight the wrong row with the arrow keys and press the Delete key - same result, one entry only.
Here is the part most guides skip: if you keep emailing the wrong address, AutoComplete will learn it again, because learning is its job. The suggestion usually returns for one of three reasons - an old email thread keeps being replied to (the address rides along), the wrong address is saved in a contact or in the Suggested Contacts, or a colleague keeps Cc-ing it. Fix the source: update the contact, start a fresh thread to the correct address, and the deleted suggestion stays deleted.
Searching this problem online quickly leads to the Empty Auto-Complete List button in File > Options > Mail. That button does remove the wrong name - along with all roughly thousand other names you rely on every day, with no undo. It is the equivalent of burning down the house to fix a dripping tap. The X on the suggestion row exists precisely for this job. Keep the sledgehammer for a genuinely poisoned list, and even then, back up the cache file first as described in our main autofill fix guide.
Sometimes the suggestion looks wrong but is actually fine: Outlook shows the display name stored when the address was first learned, so a colleague may appear under a nickname, a maiden name or a name with a spelling mistake from your first email to them. The underlying address, shown when you hover or expand the name, is what matters. If the address itself is correct, you can leave the suggestion alone - or delete it with the X and let Outlook re-learn it from their next incoming email, which usually carries the corrected display name.
Watch the video to see the X delete done live, and what happens when the wrong address tries to sneak back in through an old email thread.
▶️ Watch Full VideoAutoComplete relearns any address you use again. The usual route back is an old thread: you reply to a long email chain that still carries the wrong address in To or Cc, and Outlook notes it again. Delete the entry once more, then start a clean new email to the correct address instead of replying on the old chain.
No - suggestions cannot be edited in place. Delete the wrong entry with the X, then send one email to the correct address and Outlook learns the right entry fresh. If the wrong text came from a contact's display name, fix the contact as well, otherwise the old name can be re-suggested from there.
Neither. The X removes only the AutoComplete memory entry. The person stays in your contacts if they were there, and every email you exchanged stays in your folders. It is the safest delete in Outlook - which is exactly why it is the right tool for one bad name.