Codeman

Hi all, I don't know if this is the right place for this but here goes, I'm having a problem here I hope you can help with, I've got a web server using iis6 and php, php config is setup to use my sbs2008 SMTP server to send email. My problem is that about 7 times out of 10 the email fails but sometimes it works fine. I've actually got owncloud setup but when it comes to sending an email its very intermittent. I wonder if there's a way to diagnose what's happening or if someone has seen this before.