If it is only certain sites, then you may have been put on
one of the spam sites that list spam originating (or open
relay) sites.

If it happens for all outbound (from your own domain)
email, then you need to check your authentication/relay
settings.

My money is on the first suggestion! <g>

quote:

>-----Original Message-----
>"You do not have permission to send to this recipient.
>For assistance, contact your system administrator.
>            <exchange.meritlending.com #5.7.1 smtp;550
>5.7.1 Unable to relay for saellis@atc-ca.com>"

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