Someone asked their search engine "how to allow apostrophes in email addresses".

Surprise surprise: apostrophes are allowed in email addresses, although not recommended as they may not be treated correctly along the way by some mail servers or for example SQL-based customer databases.

More information:

• Email addresses with a + are valid (see also the comments)
• Characters in the local part of a mail address (Good analysis of RFC2821 and RFC2822 plus recommendations)

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