Unable to communicate with users using Iburst

I am unable to send E.MAIL Correspondance to any of my contacts using IBurst South Africa .<br> I have contacted their technical support BUT have unfortunatly not had any success in solving the problem .<br> It has been a problem now for over 2 years <br> <br> Here is a transcript of last conversation <br> <br> Dear sir I thank you for your prompt reply I have attached error reports for your attention as requested and look forward to hearing from you with a solution to the problem<br> <br> .1<br> <br> This report relates to a message you sent with the following header fields:<br> <br> Message-id: <br> <br> Date: Wed, 27 Nov 2013 18:22:33 +0200<br> <br> From: Howie <br> <br> To: Howie <br> <br> Subject: a great motivator<br> <br> Your message is being returned