Interesting, I had thought JIRA would stop such a silly thing from happenening, but the admin console at least doesnt stop it.
The basic mail handlers do a user lookup from the sender of the email so it should not be possible to do that from email, do you have a case where this is a problem?
JEMH also does a lookup, pre 1.0 also contained a feature to disambiguate email addresses (where say in a corporate network, LDAP contains mulitple email accounts that are owned by a common user id, and that user id is the 'name' of the user to be created), but I havent quite got to re-implementing LDAP yet. the implementation then was pluggable, but at a code level. I can see pluggable validators (or even scripted validators) as part of JEMH.
I think this is a question that has a 'you dont need to do that' (with caveats). If you have a scenario where this is a problem, please elaborate.
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