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What characters are allowed in email address?
I have an email address with an apostrophe in it and am wondering if that is valid?
This issue occurred because the message was sent using the UTF-8 character set, which the receiving email system doesn't support. To fix this, the sender can try sending the message using a different, supported character set.
As far as I'm aware, you can only have one. The @ symbol is the delimiter between the domain name and the address name; multiple @ symbols would very likely confuse the email parser.
The local-part of the email address may use any of these ASCII characters: uppercase and lowercase Latin letters A to Z and a to z ; digits 0 to 9 ; special characters !
Yes, according to RFC 3696 apostrophes are valid as long as they come before the @ symbol.
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