[wxlua-users] Test to see why my mail is rejected

I can't seem to send anything to this list... These are the warnings I
get until the mail is finally discarded.

Regards,
     John Labenski

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This is an automatically generated Delivery Status Notification

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

Delivery to the following recipient has been delayed:

    wxl...@li...

Message will be retried for 2 more day(s)

Technical details of temporary failure:
TEMP_FAILURE: SMTP Error (state 9): 451-Could not complete sender verify callout
451-Could not complete sender verify callout for <jla...@gm...>.
451-The mail server(s) for the domain may be temporarily unreachable, or
451-they may be permanently unreachable from this server. In the latter case,
451-you need to change the address or create an MX record for its domain
451-if it is supposed to be generally accessible from the Internet.
451 Talk to your mail administrator for details.