Max alias levels MTA option

Alias and address MTA options:  (integer)
The  MTA option controls the degree of indirection allowed in aliases, that is, how deeply aliases may be nested, with one alias referring to another alias, etc. This applies to  direct LDAP alias lookups, as well as to traditional (legacy configuration)  alias database and  alias file lookups. The default value is 10. See Alias recursion and nested list definitions for some additional discussion.

See also:
 * Alias and address MTA options
 * Direct LDAP usergroup lookup MTA options
 * Aliases in LDAP
 * Alias file
 * Alias recursion and nested list definitions