smtp-validate-addresses verified
Strictness of address validation
in the configuration this is a line
smtp-validate-addresses: …How strictly submitted envelope and recipient addresses are checked against the standard.
Values
- Values
strict · loose- applying
restart required- where it can be set
in the config file · with a startup flag · as an environment variable
In detail
Strict validation refuses addresses that do not conform; loose accepts what the standard frowns on but the world produces. Which is right depends on where the mail comes from — a customer list imported from a decade-old CRM will contain addresses no strict parser accepts, and refusing them at submission is better than sending them, since a receiving server will refuse them anyway.