550 error message using mercury as email server

  Kay-339342 21:22 10 Dec 2004

I have just formated my computer and changed Broadband ISP at the same time. I can't get Mercury to send messages I get failed messages "550-direct deliveries from this dynamic/dialup ip refused, use your ISP's smarthost". I am using Tesco Broadband is it a problem with them or my system. I have checked my Mercury setting against someone else and they are the same (his is working).

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