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For example:
jon.o'[email protected] ?
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The same contact can either have quotation marks or not; the quotation marks are sometimes there when sending an original email, sometimes they appear when replying or forwarding. None of these contacts has quotation marks in the "Display As" field.
Yes, according to RFC 3696 apostrophes are valid as long as they come before the @ symbol.
Yes, jon.o'[email protected] is a valid email address according to RFC 5322.
From the Email address article at wikipedia (Syntax section):
The local-part of the email address may use any of these ASCII characters:
- Uppercase and lowercase English letters (a–z, A–Z)
- Digits 0 to 9
- Characters ! # $ % & ' * + - / = ? ^ _ ` { | } ~
- Character . (dot, period, full stop) provided that it is not the first or last character, and provided also that it does not appear two or more times consecutively (e.g. [email protected]).
(The syntax is formally defined in RFC 5322 section 3.4.1 and RFC 5321.)
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