option to block/allow plus char in new email names

Version 1.61.5

Feature
Finished

A user+name@domain.com email address is "valid" to send to, but the + char is not intended to be used for account as it's reserved for sieve filtering: https://tools.ietf.org/html/rfc5228 Extra check added for email, forwarder creation, to no longer allow + characters in the name. Internal default: allow_email_plus=0 where you can turn it on to still allow the + character by typing: cd /usr/local/directadmin ./directadmin set allow_email_plus 1 service directadmin restart ---- T29233

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