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Question: Mail App Send Error - Invalid Address

We're in an Exchange environment. A user is sending an email and receiving an error saying the following:

Invalid Address

"'firstname@company.com'" does not appear to be a valid email address. Do you want to send it anyway?

He's sending on an iPhone on IOS 11.2.2. The email is a valid email address within the same company. the email format is the user's first name @ the company name (one word).com. No additional spaces or periods. He has emailed this user before without issues. It just started happening out of nowhere. He's not sending on Wireless and has Verizon LTE coverage.

Any ideas what's going on?

Thanks in advance.


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User profile for user: jestrella18

Question: Mail App Send Error - Invalid Address