troubleshooting Question

Allow external users to relay through exchange 2010

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PlexioUKFlag for United Kingdom of Great Britain and Northern Ireland asked on
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Hi we need to allow associates who have an email account on an SBS2011 box (which they access via POP3) to relay mail via the same server.  At present they cannot relay - they get '550 5.7.1 Unable to relay'.

I assume that a new connector is required for this, but am unsure of how to set this up to allow external relay without compromising the security of Exchange.

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