I send to bob@gmail.com (example) and get an error sending to bob@gmaill.com, only for this one person. Note the extra "l" in the email the system tried to send to, which was not in the address I entered.

Can't find a typo in the contact or anywhere else in the system, but don't know where else to look. Some typo somewhere?

Error says: bob@gmaill.com - DOMAIN_NOT_RESOLVED (note the extra "l" that was not in the original email I sent, I've tried multiple times typing the address correctly, and it keeps having this error, just for this one person.