Hello we had an issue where a customer had a massive mail queue

error in redirect data: missing or malformed local part (expected word
> > or "<") in ":fail"

After checking in the /etc/valiases/******.com domain I found that the aliases file was broken.

the user can edit this file via cPanel it's the forwarders file and default actions. Users do make mistakes on this file its common as they miss the last ':' .

Can there Either be stricter sanity checking on the input or a radio selection box to select fail, otherwise freeform test to enter an email address or script