a really strange one (again)

[Simon Rae]

Hi   Our Qmail 1.03 box is having problems getting mail from one particular site and I've been told to try and sort it out. When mail comes in from this site, I can watch the connection using netstat. The connection from their MX goes from ESTABLISHED straight to CLOSE as if the connection is getting broken. As qmail-smtpd doesn't provide log info I had to get a copy of their NTMail log file. It shows the following for most deliveries to our site.   waiting 10038 mailhost.oursite.com (hmmmm.....10038. Winsock error?????) eventually mail is sent back to the sender undelivered. I'm 99% sure it's something at their end but in the interest of workplace harmony it'd be nice to get to the bottom of it.   Any help appreciated   Simon Rae