Monday, November 23, 2009

450 Client host rejected: cannot find your hostname

- Turn off reject_unknown_client; which rejects the request when the client IP address has no PTR (address to name), or when the PTR record does not have a matching A record (name to address).
- Turn off reject_unknown_hostname; which rejects the request when the hostname in the client HELO (EHLO) command has no DNS A or MX record.

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