Well, without the knowing the domain in question, it is hard for us to help you. You can go to www.dnsreport.com <http://www.dnsreport.com/> and enter the domain and test it. John Tolmachoff Engineer/Consultant/Owner eServices For You -----Original Message----- From: Mark M. Friedman [mailto:mark@xxxxxxxxxxxxxxxx] Sent: Tuesday, April 06, 2004 5:35 AM To: [ExchangeList] Subject: [exchangelist] Error from yahoo: wasn't able to establish an SMTP connection. (#4.4.1) http://www.MSExchange.org/ I have been getting this error message with a couple of clients now. It only happens when someone from yahoo wants to send a few of my clients an email from yahoo. My clients can send them an email with no problem. DNS appears to be ok with no other domains being blocked. No blacklists, etc... Let me know if you need more info. This is the Message: Message from yahoo.com. Unable to deliver message to the following address(es). < <mailto: <mailto:user@xxxxxxxxxx> user@xxxxxxxxxx>> <mailto:user@xxxxxxxxxx> user@xxxxxxxxxx>: Sorry, I wasn't able to establish an SMTP connection. (#4.4.1) I'm not going to try again; this message has been in the queue too long. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------