How to fix "Recipient address rejected: Domain not found" [Kaspersky Secure Mail Gateway]
Entry posted by svc_kms in How-to
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Issue
During initial deployments you may encounter errors like this:
Jun 3 12:50:13 ksmg postfix/smtpd[841]: NOQUEUE: reject: RCPT from ksmg.example.com[10.10.10.1]: 450 4.1.2 <test@example.com>: Recipient address rejected: Domain not found; from=<test@example.com> to=<test@example.com> proto=ESMTP helo=<example.com>
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This means that the recipient domain could not be verified in DNS.
Solution
There are multiple ways to avoid it:
- create a proper DNS records for the mentioned domain on the DNS server that is used by KSMG
- configure to use a different DNS server that has proper records
- just disable this check in Settings -> MTA -> Advanced Settings -> Reject messages for unknown recipient domains
When that check is enable, requests are rejected, when the RCPT TO domain has
- no DNS MX and no DNS A record
- a malformed MX record (a record with a zero-length MX hostname)
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