Best Practises for Email Addresses?

Hi Guys,
Are there any best practise guides / documents / etc. for configuring user's E-mail addresses? We have a large turnaround of users and obviously sometimes they have the same name as previous/current employees (we
do not delete any old accounts / mailboxes.) My question is whether or not it is OK to use numbers in an email address (i.e. [email protected])?
Thanks
Stephen

Hi,
It's OK to use numbers in an email address.
The format of email addresses is local-part@domain where the local-part may be up to 64 characters long and the domain name may have a maximum of 253 characters.
The local-part of the email address may use any of these ASCII characters RFC 5322
Uppercase and lowercase English letters (a–z, A–Z) (ASCII: 65-90, 97-122)
Digits 0 to 9 (ASCII: 48-57)
Characters !#$%&'*+-/=?^_`{|}~ (ASCII: 33, 35-39, 42, 43, 45, 47, 61, 63, 94-96, 123-126)
Character . (dot, period, full stop) (ASCII: 46) 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. John..[email protected] is not allowed.).
Special characters are allowed with restrictions. They are:
Space and "(),:;<>@[\] (ASCII: 32, 34, 40, 41, 44, 58, 59, 60, 62, 64, 91-93)
The restrictions for special characters are that they must only be used when contained between quotation marks, and that 3 of them (The space, backslash \ and quotation mark " (ASCII: 32, 92, 34)) must also
be preceded by a backslash \ (e.g. "\ \\\"").
For more information, please refer to this similar thread.
https://social.technet.microsoft.com/Forums/exchange/en-US/69f393aa-d555-4f8f-bb16-c636a129fc25/what-are-valid-and-invalid-email-address-characters
Best Regards.

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