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[cobalt-security] Different relaying denied question



Hello,
I have over 60 domains on my Raq4, and a problem on the newest site I've
added has been brought to my attention. I have POP before SMTP set for the
Raq. Eventhough I have can send email to the domain's new email addresses
from other domains on my server, I cannot send send email from other ISP's.
When I try I receive an error something similar to below. I cannot
understand why I'm getting that particular error message as I all I'm trying
to do is send an email to an address on my server from another ISP. Can
anybody advise?

 <info@xxxxxxxxxxxxxxxxxx> xxx.xx.xxx.xx (My IP Address) does not like
recipient.
Remote host said: 550 5.7.1 <info@xxxxxxxxxxxxxxxxxx>... Relaying denied.
Please check your mail first.
Giving up on xxx.xx.xxx.xx (My IP Address)

Thanks,
Declan.