Wildcards can appear in the name or domain sections
of an email address. The following are valid examples:
-
name@*: Valid representation of the whole name.
-
*@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.
-
*name@domain.tld: Invalid use in conjunction with a name.