> Yesterday  I've changed this option to "No Mail Relay".

Even  if  so,  you haven't restarted SMTP, since I can send using your
server.

> But  it  seems  that  this  method can't solve the problem. We still
> can't   send   email  to  recipients  under  pg.com  and  few  other
> recipients.

You have to make sure you're off all the blacklists--info at DNS Stuff
will  help  a  lot  to  start.  The recipients are not responsible for
removing you.

> But  we  can  send email to most other recipients successfully. It's
> really very strange. Did you ever run into this situation?

Blacklists  do  appear  strange/intermittent until you get the hang of
never being on them. :)

-Sandy


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