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On Sat, September 24, 2011 21:35, Ryan Novosielski wrote:

I still suspect sendmail. I'd check differences between the sendmail config on the old and new. Also see if there is anything stacked up in /var/spool/mqueue or clientmqueue and your mail logs (/var/log/syslog by default on RHEL isn't it?).

/var/log/maillog by default on RHEL 3-5, at least. /var/log/messages for most syslog facilities.