email stucked on queue SMTP

I have a CDOSYS routine to send emails with my server on 127.0.0.1 25
Now I have windows 2008 Server with IIS 7 but all begin fine the cdosys routines end emial perfect. Now after many emails some was not send other yes and others stucked on queue dir and the worst now I have mails stucked on the queue dir and all news are stored there and not sent.
I made this test:http://support.microsoft.com/default.aspx?scid=kb;en-us;153119
to know if working wut when I arrive to the command send the system tell me:
250 2.6.0 <14933-710785FIy4gs900000005@14933-71078> Queued mail for delivery
In other words like I said was stored on queue directory and stucked and not send what can i do to make the stukced maill on queue send? and off course avoid this happen again?
Thank you
coerraceAsked:
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coerraceConnect With a Mentor Author Commented:
I solve using a checkmark on IIs 7 on smtp settings and use localhost that's it.
Thank you anyway
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meverestCommented:
Hi!

This is usually related to the recipient mail server settings.  Your email may be rejected by the destination mail server for many reasons - check the smtp service log for clues as to why it is not sending.

To find out the log location, look at smtp server properties and click on 'properties' button for logging - also, choose "NCSA Common" format which is the most useful of the different log file types.

Cheers.
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coerraceAuthor Commented:
Solve by myself
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