What Is The Best Way To Fail An Unqualified Recipient Domain Name? (Doc ID 2604109.1)

Last updated on AUGUST 08, 2022

Applies to:

Goal

What is the best way to fail an unqualified recipient domain name?

Using this rewrite rule:

 * $U%$&0.&/IMTA_DEFAULTDOMAIN/

appends the default domain name to any unqualified recipient domain name (but does not set destination channel).

i.e., RCPT TO: <local_user>@<some_example.com>

will be rewritten to <local_user>@<some_domain>.<default_example.com> and run through the rewrite rules again.

If that rule is removed...

Prior to the explosion of TLDs, that might have resulted in "5yz 5.1.2 unknown host or domain: ..."

But now <local_user>@<some_domain> gets sent to tcp_local because <some_domain> is a valid TLD.

It's possible to rewrite to @bitbucket-daemon, but we would prefer to reject unqualified recipient addresses.

NOTE: NO LDAP config is being used.
 

Solution

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