Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
> All the delay seems to be in transferring the message from
> postgresql.org to webmail.postgresql.org ... which are the same
> machine, or at least the same IP address. What's up with that?
You are seeing sendmail's poorly designed queuing behaviour in action.
sendmail limits itself by outgoing messages, rather than outgoing
deliveries. This causes one slow delivery to hold up many fast
deliveries.
Ian