Hot on the heels of a woman who blames a bug in Firefox for exposing the flaws in her relationship with a fiancé comes the tale of a young lad whose relationship was hit by the spam filtering shortcomings of Thunderbird, the email client companion of Firefox.

"Last year, my girlfriend of 15 months went away to Costa Rica on a World Challenge team. Her mobile wouldn't be working, but she said she would call when she got a chance," Reg reader Matt writes.

"Unfortunately, she emailed me first, and the email was binned by Thunderbird's mail filter. When she didn't receive a reply, she mailed me again... and again. I'm sure the rest will be obvious," he adds.

Indeed it's all too painfully clear. Products from the Mozilla Foundation might be a great alternative to Microsoft software but they're liable to ruin your sex life, if Matt's experiences are anything to go by. Don't say you haven't been warned. ®