Any antivirus/antispam software on your Exchange server? Kurt
On Tue, Nov 24, 2015 at 12:04 PM, Russ Patterson <[email protected]> wrote: > I'm curious, all - if there's a 15-45 second delay between the time you > type > "Enter . Enter" > and the time you see the "Queued for Delivery" response > in an SMTP conversation, and it only occurs when the RCPT TO: line has an > external to your Exchange 2013 email address, what is causing the delay? > > If the RCPT TO: line has an accepted domain address, the "Queued for > Delivery" response is immediate. > > I'm pretty sure the telnet session is passing thru an F5, but I do see an > Exchange SMTP banner at the start of the telnet session. > > Any ideas? I'm tempted to say DNS/AD lookups, but then again, I'd expect > that to be after the SMTP session was done. > > Thanks! > > Russ
