Problem with outbound mail

[silentsam33]

I have a 1 server environment running Exchange 2000 sp3 rollup and Windows 2000 SP3. I am having a problem mailing to two outside domains, yahoo.com and encore.ca (our travel agent). If I telnet to yahoo (mx1.mail.yahoo.com) I get the 220 OK and after the ehlo command I get a number of 250 messages but no 250 OK. If I try a Mail From: command I get the following,
"501 Syntax error in parameters or arguments" instead of 250 OK - mail from user@domain.com
I have tried sending to a hotmail account via telnet with no problems and all other outbound e-mails seems fine.

FYI.... Our Exchange server does sit behind a ISA 2000 server.

Does anyone have an idea of what is happening or where to begin troubleshooting. Thanks for any suggestions.

 

[Marcs41]

See:

http://support.microsoft.com/default.aspx?scid=kb;en-us;311237

Marc
_{If 'something' 'somewhere' gives 'some' error, expect random guesses or no replies at all. Please specify details.
Free Tip: The F1 Key does NOT destroy your PC!}
How Do I Get Great Answers To my Tek-Tips Questions? See faq222-2244

 

[silentsam33]

Thank-you for the post, but I do not think the ISA server has anything to do with this, as we have had this same setup for over a year. We curremtly are having problems sending to yahoo.com, yahoo.ca and rogers.com (a large Canadian cable ISP). I believe the problems involves the merging of these two companies mail systems in Canadian a couple of days ago. Since that time sending mail to either of these is hit and miss.

 

[Marcs41]

http://www.google.be/search?sourcei...q=501+Syntax+error+in+parameters+or+arguments

Marc
_{If 'something' 'somewhere' gives 'some' error, expect random guesses or no replies at all. Please specify details.
Free Tip: The F1 Key does NOT destroy your PC!}
How Do I Get Great Answers To my Tek-Tips Questions? See faq222-2244