We've been seeing delays of up to a couple of days on our outbound mail to Yahoo.com for most of this month. Last night I turned on logging and raised the thread limit from 1 to 6 and then 12, and cleared off around 1300 messages to 14,000 recipients. What I was seeing in the log was a substantial number of "%SYSTEM-F-CONNECFAIL" and "%SYSTEM-F-LINKDISCON" and some responses to "Mail From:" of: >>> 421 mta619.mail.yahoo.com Resources temporarily unavailable. Please try again later. I'm guessing that YAHOO's individual engines are looking at the amount of traffic they are getting from single sources and are, uh, load limiting? Trying to block spammers? What ever happened to the philosophy of making the delivery of the mail the top priority? -Kary