IP being blacklisted

[SIZE=3][LEFT][FONT=Helvetica Neue]The IP 173.0.129.16 is currently showing as LISTED on the SORBS-SPAM blacklist, and it is causing my client’s email to be rejected or junked. [/FONT][/LEFT][/SIZE]

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I’ll have someone attend to this asap.
Meanwhile can they use webmail?

Please provide us the bounce back message on ticket which you are getting. We are investigating the same, we will update you back on ticket as soon as possible.