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I have a snow-leopard os-x Server configuration running postfix with no local firewall on the X-Serve.

When a client attempts to connect to the SMTP port the connection takes about 15 seconds to accept the connection and get the smtp id string back.

Does anybody have any idea what the delay could be.

telnet smtpserver 25 takes 15 seconds externally

telnet localhost 25 is almost immediate

Using tcpdump on incoming firewall (separate host) and smtp server for the port shows that the connection is being passed through almost immediately but the response is very slow in coming back.

Thanks for the support.

share|improve this question
    
where is smtpserver defined - the name lookup for this would seem to be the most likely issue –  Mark Dec 13 '11 at 11:37
    
smtpserver is a generic name. The real host name is used when I do the test. The dns resolution is not an issue here. You could substitute the ip address for exactly the same result. –  sweetfa Dec 14 '11 at 0:39

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