Hello,
Since the difficulties on Server 24 earlier this week, people have encountered a pesky problem when posting to my site's phpBB board. I've finally pinned down the source of the problem, and it is this:
Whenever someone posted a reply to a thread, and as a result, someone would receive a reply notification email, if that email would go to certain domains, php's mail() call would fail.
The domains I've had problems with are hotmail.com, yahoo.com, msn.com, and aol.com. As you can imagine, that's a lot of my userbase.
After some digging around, I noticed my phpNuke site has a backlog of new user registrations pending activation. Not surprisingly, each of those pending users had an email address from one of the four domains I've mentioned. In the past 24 hours, I've got 10 people who have signed up, but can't get the email which activates their accounts. I have had users successfully register, but their email domains were not one of the big four.
I realize I can't ask for help debugging 3rd-party scripts, but I don't think that is where the problem lies. Have any changes been made recently which would prevent my domain from using php's mail() function to email certain domains?
kono