Another possibility: tarpitting or throttling on the SMTP host. Be sure your LISTSERV's IP has been exempted from anti-spam measures like that on your SMTP host. On Feb 11, 2013, at 3:37 PM, Valdis Kletnieks <[log in to unmask]> wrote: > On Mon, 11 Feb 2013 15:17:07 -0500, Liam Kelly said: > >> As to why your SMTP server is taking so long, you'll need to run it down >> from that end. Some of the usual causes are things like inefficient >> anti-virus and/or spam scanning of every message (my first guess), a disk >> I/O bottleneck on the mail spool disk, inbound mail throttling, or >> inefficient directory lookups for addresses to route locally. Whatever >> the case may be, you aren't going to be able to figure it out by looking >> only at LISTSERV's end of things. You need to go to the mail server. > > Even today in 2013, an amazing percent of SMTP servers have broken DNS > setups that cause a lot of waits for DNS lookup timeouts. Just a thought... > ############################ To unsubscribe from the LSTSRV-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1