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Help: Unable to send mail due to smtp relay issue

I have run into a problem which I just dont seem to find an answer to. Our exchange server can receive email but for some reason we are unable to send emails. Every email we send mail to an external domain the email is bounced immediately with the following error message:
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <mydomain.co.uk #5.5.0 smtp;550 relay not permitted>

I have tried everything I can find to correct this but am unable to find any answers. Can someone help me figure out what is going wrong. I have run ExBPA and it finds not errors. I have run the Internet and Email Config Wizard, again successfully. Which leads me to believe that what ever is causing my problems is either something very obvious or deep down in the configuration which I am not familar with. I am running SBS 2003 r2 + Sp2.

Jay_Jay70

Fernbank74,

you may well be blacklisted
http://www.mxtoolbox.com/blacklists.aspx

Regards,

James

redseatechnologies

If it is bounced immediately, it is more likely that you are doing something wrong.

Do you have the same issue when using OWA?

Sembee

Do you send your email out directly to the internet or do you use a smart host?
Has it ever worked?

Simon.

Fernbank74

ASKER

I have check with MXTool box and I am not blacklisted.

The error occurs I use the OWA (assume the web interface for outlook) or a standard outlook client. I am trying to retrieve the message from the POP3 account from my ISP and send them through their server since I am unable to send them directly to the external domains because I dont have a static IP address.

Sembee

If you are sending email through the ISP, then you should probably speak to the ISP to see if they will allow email from your domain to be relayed through their server. Some ISPs allow anything to go through, others only allow domains that they know about to go through.

Simon.

Fernbank74

ASKER

Thats not really an issue in this case since I can configure a pop3 client to directly send mail through the ISP. The other reason why I am sure this is not the issue is because my ISP also hosts my website.

Domain and website hosted by ISP
Mailbox hosted by ISP but sorted locally.

Fernbank74

ASKER

My ISP wont allow SMTP relay on Port 23, 25, 26, 8001, and 2525, which is wht I can send mail. Is thereway of not relaying the mail but transfering the mail to the ISP mail box so that I can send mail whilst I find an alternative ISP.

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Sembee

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SOLUTION

manicsquirrel

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manicsquirrel

Sorry, as I re-read it seems the guy wasn't a Microsoft employee, but it helped nevertheless.

Fernbank74

ASKER

Thanks that seemed to resolve the problem

Fernbank74

ASKER

Is there any reason why a setting which was working suddenlybegins to revert to the above error. My system was working but all of sudden after a windows update the above error comes back without any changes to the exchange server.

manicsquirrel

No idea, but you might want to close this question because the issue was resolved over two months ago. Then you might open a new question and reference this one.

manicsquirrel

Check your SMTP Connector and write down the ip address you have entered. Re-run your CEICW using your ISP outgoing mail server name. Next, ping your mail server from a command line. See if your mail server's ip address has changed from the one you had been using in the SMTP connector. Lastky, see if using the ISP's mail server name rather than the ip address works now.

Computer101

Forced accept.

Computer101
EE Admin