You guys are pretty funny.
I used to be one of the lucky ones (or at least, that's what I thought). But then the 3G monster crept up on me, and now there are gremlins every now and again. Hopefully you guys stay lucky - the technology has to stabilise at some point, and maybe you guys are some of the first to benefit from the beta testing I've been doing the last year or so!
Anyway, agentpt, the SMTP server has given a lot of trouble in recent times. You may recall that it fell over completely not all that long ago, but according to V3G, things have been sorted out. I haven't been trusting the server just yet, so I've been BCC'ing myself on all outgoing messages. So far, after more than 200 messages, I haven't had any issues. Maybe try BCC'ing yourself for a while, just to see where the problem lies - it might not be the Vodacom SMTP at all...