I just got the email on my work email address (obviously they don't believe their users would use their sentech email) and this was my response:
<i>To Whom It May Concern
As it is completely impossible to commit "network abuse", even if I wanted to, on such a slow connection, I cannot understand the relevance of this email communication. I would suggest that the recent revelations about your open proxy and other concerns about your network configuration (e.g. congestion on your microwave backlinks), are to blame for the poor througput customers are experiencing, rather than a few individuals somehow abusing the less than analogue modem speed throughput your supposed "broadband" service effectively provides.
Might I also draw your attention to Sentech's often quoted promotional material that clearly states "Our wireless network provides <b>unlimited</b> access at one flat fee...". I would accept that hosting http/ftp/nntp servers that generate excessive traffic is not necessarily "fair use" or an appropriate use of mywireless, however, I do not believe that this is what is causing the problem, or that users would even be able to do this given the current state of mywireless. To raise this as an issue implies that you are placing the blame for the poor throughput on your customers and not paying proper attention to your network infrastructure. In any case, please would you clarify what your understanding is of the word "unlimited", as it makes no sense to claim you are offering an "unlimited" service as long as you don't exceed some sort of arbitrary limit you impose, when and if you make a subjective judgement about where that limit is.
Frankly, after last week's debacle with your open proxy, and Sentech's statements in the media implying it's customers were at fault, I was expecting an apology from Sentech instead of a seemingly misguided and unclarified warning about "monitoring excessive network usage". I'd also like to point out the irony that you have transmitted presumably thousands of 46KB word document file attachments to external email addresses when the message could have been sent in plain text in about 2KB, thus saving hundreds of megabytes of bandwidth - isn't that unnecessary excessive usage?</i>