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Old 2nd March 2007, 19:04
wonka wonka is offline
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The mail server is using a public IP address. The IP that the log shows is the address of the PC where the email is sent using the mail server. If I use a public IP address on the PC, I get the same error, but with different IP:

reject=550 5.7.1 <>... Relaying denied, IP name lookup failed [public_ip_of_PC_that_sends_the_email]
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