[cots]

I replied to a couple of member emails today but both were returned with this

<< 550-5.7.1 [64.246.38.85 1] Our system has detected an unusual rate of
<<< 550-5.7.1 unsolicited mail originating from your IP address. To protect our
<<< 550-5.7.1 users from spam, mail sent from your IP address has been blocked.

WTF? How do I get around this - especially if we are planning to do email marketing?