mailing list losing mail?

[Mike Wright]

g wrote:
> g wrote:
>> Mike Wright wrote:
>>> Hi all,
> 
> <snip>
> 
> this email took about 6 minutes to come back thru list.
> 
> 
>> why delay, i can not answer.
> 
> but i do see where.
> 
> while waiting, i looked at you email of 2010.0108 and i did note a delay
> of about 1 hour.
> 
> being that you are using thunderbird, use <ctrl+w> to have a look at headers
> and you will see where it was delayed.

Thanks g,

This is from the last 9 messages headers.  At first it looked like dns 
errors, then maybe greylisting, but I think the variation in delivery 
times points to something else.  The delay is always between my server 
and the server below.

Received: from mx1-phx2.redhat.com (HELO mx01.util.phx2.redhat.com)

00:28:14
00:28:21
00:28:13
00:24:56
00:26:41
00:24:43
00:28:46
00:26:50
00:20:08

Mine is a qmail server that's been in service for years.  Neither it nor 
its dns has been changed (that I remember) and all other mail seems to 
show up almost immediately.  I've been on this list for a really long 
time and never had problems before.

Wonder what it could be?