Thats an error for a PHP send-mail script - don't think its of major concern unless you subscribe to posts through email. Your message still gets sent.
Hi Mark,
I'm having said problem above. I keep getting fired out of replies back into the forum index as well. Not really my choice of software so can't really tell you much about it.
Btw sorry about the delay to emails I was at a conference all last week.
I'm still not sure what the root cause of the problem is. Anyone got any ideas? From my research on all the phpBB support forums it could be down to the configuration of the hosting server. I've contacted the hosting company to see if there's any problem at their end. I'll keep you all posted!