This has been driving me a bit loopy because I've got some grasp of Exchange, but not enough to know what's going wrong in some scenarios or how to find out ("just enough to knowledge to be dangerous" some might say 
Anyway, we host our own mails on an Exchange Server here. Mails are coming in fine, but outgoing is causing a problem. We send outgoing mails through our ISP's mail server, which requires authentication. Until 2 days ago, this was working fine, but since has stopped and our ISP can/will not give us any useful information re: anything they've changed or what we need to do to get it going again.
The error I've getting is "The remote SMTP service rejected AUTH negotiation". The Default SMTP Virtual Server has Outbound Security set to Basic Authentication, with our username and password (confirmed Ok by our ISP). There are no SMTP connectors in use.
What I don't understand, is that if I set up Outlook Express with all the same details as Exchange has (using one of our domain name e-mail addresses, setting up the Outgoing Mail Server to require authentication, etc..) then e-mail go out just fine.
In fact, if I use Telnet to connect to the ISP mail server on Port 25 and send mails using SMTP commands, that works fine! Bizarrely, it seems to work through Telnet whether I use "auth login" (and base64 encoded user name/password) or whether I use no authentication at all and just tap in "mail from" etc..
I just really don't know what's going on, can anyone help me clear this up?
Thanks for reading,
Dan.
PS: Does Exchange keep any record of the SMTP exchanges? Could I, for example, view an exchange that was rejected and see what SMTP commands/responses went back and forth?
Anyway, we host our own mails on an Exchange Server here. Mails are coming in fine, but outgoing is causing a problem. We send outgoing mails through our ISP's mail server, which requires authentication. Until 2 days ago, this was working fine, but since has stopped and our ISP can/will not give us any useful information re: anything they've changed or what we need to do to get it going again.
The error I've getting is "The remote SMTP service rejected AUTH negotiation". The Default SMTP Virtual Server has Outbound Security set to Basic Authentication, with our username and password (confirmed Ok by our ISP). There are no SMTP connectors in use.
What I don't understand, is that if I set up Outlook Express with all the same details as Exchange has (using one of our domain name e-mail addresses, setting up the Outgoing Mail Server to require authentication, etc..) then e-mail go out just fine.
In fact, if I use Telnet to connect to the ISP mail server on Port 25 and send mails using SMTP commands, that works fine! Bizarrely, it seems to work through Telnet whether I use "auth login" (and base64 encoded user name/password) or whether I use no authentication at all and just tap in "mail from" etc..
I just really don't know what's going on, can anyone help me clear this up?
Thanks for reading,
Dan.
PS: Does Exchange keep any record of the SMTP exchanges? Could I, for example, view an exchange that was rejected and see what SMTP commands/responses went back and forth?
