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Sharepoint Outbound SMTP server configuration issue - NON exchange scenario

I have noticed some weird things!

Keep in mind that we are using shared hosted exchange. I did use hosted service providers SMTP address unauthenticated way but I had issue to sending email outside! (please refer to this case:

So I tried to play with it, change it, authenticate it etc...then I found that even if I type any name as SMTP server(like test,test.com) and  even I have stopped virtual SMTP server on IIS-6, the effect is same! I could send email to internal staff but not outside domains like Gmail yahoo etc...

How it possible ?
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Shab
Asked:
Shab
2 Solutions
 
Mohammed KhawajaManager - Infrastructure: Information TechnologyCommented:
This may explain why.  If you use the service providers SMTP server then they may allow internal routing without authentication which means that message will be delivered to any IP address they own.  They will not route it outside of their jurisdiction.  I have also seen some providers will allow message from where sender and recipient address is from same domain.  The resolution is to either use authentication or have the provider whitelist IP your SMTP server address.  You will configure your SMTP server to forward messages to the provider's SMTP address.
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Justin SmithSr. System EngineerCommented:
Didn't you state in the other question that your provider doesn't allow for external relay?

The SMTP server on the SharePoint server isn't needed, unless you are using it as a smart host to authenticate to your provider's SMTP server.  If this is what you are trying to do, what are your settings and have you verified your provider allows this?
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ShabAuthor Commented:
Yes my service provider required authentication to send to external client as mentioned in my previous post and just now I have followed below link and now messages are stuck on queue folder ? Any idea?

This blog
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