Battling to send mail since going on to Contract

Urgent assistance needed please. <br> <br> I went on to an Internet contract on 2 August 2015 and now have major issues trying to send email. <br> <br> When sending a single email, to a single mail address, I get an automated reply from ***rnal blocking mail with the subject: Considered UNSOLICITED BULK EMAIL, apparently from you. The latest reference code is: Our internal reference code for your message is 03848-01-2/AcX9Qqi+eGnM<br> <br> I do not, and have never sent large amounts of mail or Unsolicited Bulk Email. My website manager has checked all settings on my computer and says this has nothing to do with me/my server - it is a Vodacom issue and you are directly responsible for blocking my mail.<br> <br> Please resolve the issue urgently and remove whatever block you have on my SIM card - I've used the same card for years and have NEVER had a problem - it only started when I went on to Contract earlier this month.<br>