Just been through a premium support issue where a 2013-2010 co-existence could not handle mailboxes with an ampersand (&) in either the alias and/or the email address. I'm sure I've seen this blocked as part of the email address policy but I've forgotten
where and how. I know how to format- but not how to block. Is it possible? Never been a fan of special characters in email addresses- bad practice
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