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Reference Manual of DeleGate

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DeleGate reference manual version 9.9 / verifying E-mail address
[CTX] [ALL] verifying E-mail address
AUTH="anonftp:smtp-vrfy:*"
If specified, DeleGate verifies (using the SMTP protocol) the validity of E-mail address given by anonymous users. In HTTP-DeleGate, the E-mail address must be given as Username part in Authorization. In FTP-Delegate, it must be given as a password for the anonymous user. With this AUTH, invalid E-mail addresses can be rejected. When the address is valid but is in a format like "user@host", it will be expanded automatically to a FQDN format like "user@host.domain".
If the third field is "-" (i.e. AUTH="anonftp:smtp-vrfy:-@*") only the connectivity to mail server at "host.domain" is checked.