---- dataentry configoptions ----
type             : constant
name             : EMAIL_ADDRESS_VALIDATION_LEVEL
purpose          : A choice of level of validation of an email address
allowed          : 0, 1, 2, 3, 4
default          : 3
status_s         : 
category         : subscriber management
----

Levels are:

0 - no validation, although some really basic validation is still done
1 - simple validation
2 - RFC821 email validation without escaping and quoting of local part
3 - RFC821 email validation