Emails to customers keep coming back as undeliverable

(Emails sent from x-cart php ecommerce suite)

[budbiss]

After creating some test orders, I found that each email that is supposed to be sent out to the customer comes back as undeliverable (the actual error is "unrouteable mail domain") unless it is to an address on the same domain as the store. I have tried other (verified working) emails and they all get sent back. Also, I can send emails to any email address using outlook. If anyone has any suggestions, I would greatly appreciate your input. Thanks!

[robotsdobetter]

Have you looked at the script?

[zollerwagner]

Are these email addresses ones on the big ISPs that recently began blocking messages from opt-in newsletters and similar things? It could be that your IP address is blocked, or maybe your headers or other text are set in a way that rings the spam alarm bells.

You can see some of this discussed on ****, but this darn forum won't let me give you the url!

Try a google search on your error message, and you'll find a few threads. I found the one at web hosting talk somewhat informative.

[jatar_k]

I would think you have some serious mail server config issues.

or your DNS is messed up but it isn't the php script. php just hands mail off to sendmail or whatever you have. It doesn't do the lookups or sending.

contact your host I would think.

[budbiss]

Thanks guys, I am going to call up the host now.