One of my users had problems receiving from Yahoo a couple days ago. The sender (in FLA) got this:
>> From: "mailer-dae...@yahoo.com" <mailer-dae...@yahoo.com> >> To: xx...@yahoo.com >> Sent: Sun, March 7, 2010 5:51:09 PM >> Subject: failure notice >> >> Hi. This is the qmail-send program at yahoo.com. >> I'm afraid I wasn't able to deliver your message to the following addresses. >> This is a permanent error; I've given up. Sorry it didn't work out. >> >> <xx...@slsware.com>: >> CNAME lookup failed temporarily. (#4.4.3) >> I'm not going to try again; this message has been in the queue too long. I got the sender on the phone and had him send while I watched the mail log. Nothing showed up. Then I got ahold of Yahoo's error message today. (I receive from Yahoo accounts frequently with no probs that I know of.) It looks to me like the problem has something to do with DNS, not SMTP, right? And why would Yahoo be doing a CNAME lookup? (I checked from a remote site -- my domain's MX server's IP is an A, and I don't see anything having to do with CNAMEs in 'host -t MX slsware.com'.) One of my nameservers is on an ISDN connection -- the latency there is 140ms or so (the other's a much more responsive T1). Might that have had something to do with it? -- Glenn English g...@slsware.com
