SMTP Relaying

[greenbeard]

Hello all,

I am having trouble getting some mail through to certain addresses.  I 
get an SMTPRecipientsRefused {to_address, 550 '5.7.1 
<to_address>...relaying denied.

So I am pretty sure that it is due to the target address blocking the 
relay - my machine -> my SMTP on another machine -> corporate SMTP - as 
most non-corporate address have no problem receiving.  So think I am 
hitting the RFC2505 wall here but I cant quite seem to figure out what 
fields or combination of values to load to let the mail arrive ok.

All advice appreciated.

Thanks,

gb400

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