You can use the asterisk (*) as a wildcard in email addresses when defining routes.
Wildcards can appear in the name or domain sections of an email address. The following are valid examples:
*@*: Valid representation of all email addresses.
*@domain.tld, name@*.tld: Valid representation of the whole name or the domain (not the top level domain (TLD)).
*@*.tld: Valid representation of both the name and the domain (not the TLD).
Wildcards cannot appear in a subdomain or the top-level domain. Wildcards also cannot appear with other letters; they must appear alone. The following are invalid examples:
name@domain.*.tld: Invalid representation of a subdomain.
name@domain.*: Invalid representation of a TLD.
*email@example.com: Invalid use in conjunction with a name.