A catch-all email account allows you to direct all and any emails that are not addressed to a specific email account, to be forwarded to the catch-all account. If someone spells an email address wrong, the email could be still be directed to the catch-all account.

For example with a catch-all email account all the following address would be valid:
ixfo@example.com 
fhefse345@example.com 
sal3s@example.com 
xxxx@example.com 

However, despite the potential initial advantage (before SPAM grew to it current levels), catch-all email accounts do tend to attract lots of spam email. As the possibilities of the email addresses become unlimited.

ProExe do not recommend catch-all email addresses.