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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
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