Access_errors MTA option

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Error text and error interpretation options (access_errors)

The MTA provides facilities to restrict access to channels on the basis of groups ids on UNIX. If access_errors is set to 0 (the default), then when an address causes an access failure the MTA will report it as if the error were an "unknown host" error. That is, the text of the error_text_unknown_host option will be used, so by default the error will be reported as an "unknown host or domain" error (SMTP error "550 5.1.2 unknown host or domain: recipient-address"). This is the same error that would be reported if the address were simply illegal. Athough confusing, this usage provides an important element of security in circumstances where information about restricted channels should not be revealed. Setting access_errors> to 1 will override this default and provide a more descriptive error, as specified by the error_text_access_error option, defaulting to "5.7.1 you are not allowed to use this address".

The access_errors option also controls the default text used to report recipient access mapping table $N rejections (that do not supply their own explicit rejection text). With the default of access_errors set to 0, the text used is the error_text_permanent_failure text.

See also: MTA options, Option value syntax, Getting option changes to take effect, MTA options, listed alphabetically, MTA options, listed by functional groups, Error text and error interpretation options, Mapping table options, error_text_access_failure, error_text_unknown_host, error_text_permanent_failure, Recipient access mapping tables.