[CentOS] slowness in sendmail - 60 second timeout

John R Pierce pierce at hogranch.com
Mon Feb 8 17:15:45 UTC 2010

Jerry Geis wrote:
> I am sending an email from my machine devcentos5x64.
> the transcript below (hangs for 60 seconds) at the line:
> MAIL From:<root at devcentos5x64.msgnet.com> SIZE=56 
> AUTH=root at devcentos5x64.msgnet.com
> The email succeeds - but I am trying to figure out the 60 second delay.
> Neither email server is busy. Nothing is waiting.
> the DNS on both machines point to the same nameserver. The DNS responds 
> very fast when looking up server names.
> What else can I look for to remove the slowness or delay?

check reverse DNS, eg, looking up the PTR record for the IP's of both 
hosts..    if the subnet's in-arpa.addr zone is badly delegated, it 
could be timing out on that.

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