You don't give enough information to troubleshoot, but I would
start by looking at the headers of the delayed mail message to
see where it's being held up.
On Sun, Oct 17, 1999 at 12:41:29PM -0400, Patrick Robert Aland wrote:
> We have a large mailing list (approx 2500) 95% of the addresses are local
> addresses. Sometimes when a message is sent to the list it takes about 30
> minutes before delivery begins and then about 30 minutes till it is done.
> Sometime it can take upto a day before it starts the delivery of the
> messages. Anyone have any idea why this might be?