Re: [exim] Heads up: Beware pipelining + delay command

Quoting Dave Pooser:

> Until I discovered that if pipelining_advertise_hosts is set to all (as per
> default) and the sending server is pipelining to 3 users, there's no
> response until all three delays have occurred-- and in this case 60s was
> enough for the sending server to timeout.

This was changed in 4.67, see the mailing list archive and the changelog:

PH/15 Flush SMTP output before delaying, unless control=no_delay_flush
is set.