I've had a perfect storm of email nonsense. Since moving servers I had a stack of errors saying internal replies to threads could not be delivered even though they were and after upgrading to 1.5, nothing is reaching my hosts. New registers confirmation emails are not reaching new users, Contact Us doesn't work and replies to thread notification to members are not being sent either (or at least not reaching them). I've literally spent hours on this and cannot resolve it. Anyone have any ideas?
PS. Go easy with the tech speak please, absolute newbie here - thanks!
With that error message, your host has explicitly disabled sending mail via PHP. I've really only seen this with a free host. If that's the case, I'd recommend moving to a different host (one that you pay for). Free hosts tend to add other things that cause problems.
Thanks Mike, he is indeed a free host doing me a huge favour whilst I get to grips with the whole thing. Emails and notifications worked fine on the original German servers but after they got smashed by DOS attacks, the site was moved to servers in the UK where it's never really been right since (the site's fine, just the emails). I've already emailed him a load of stuff including Paul's comments so I'll see how we get on tomorrow, hopefully we can fix it.