Special character as email name

Maintenance
1

HI Guys,

Is there a way to use special characters as email name? I tried, and it doesn’t allow me. For example, #!@abc.com.

thanks

2

you can use special characters in aliases but not in user names

3

It looks like it’s rejected by my box when sending to that alias from other email providers.

Error Details
Reported error: 550 5.7.367 Remote server returned not permitted to relay -> 554 5.7.1 #!@zzz.com: Relay access denied
DSN generated by: DM5PR01MB2492.prod.exchangelabs.com
Remote server: box.zzz.com