Summary
An invalid email address error message usually occurs when something is wrong with one of the recipient's email addresses. This could be due to incorrect spelling of the address, which is then stored in the sender's address book and auto-filled when they try to type it in.
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It could also be due to typos or incorrect domain names.
In some cases, the email address may have been disabled or deleted.
According to
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Summary
Usually, this means something is not quite right with one of your recipient’s email addresses. Sometimes a sender will have their “reply to” email address spelled incorrectly and it ends up in your address book. So, when you try to type in their address it auto-fills with the wrong address.
Why am I getting an “invalid email address” when sending mail?
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