There appears to be a slight problem with the forums at the moment… If you reply to a thread in which someone has enabled ‘notify me when a reply is posted’, you will be present with a nice error:
Could not connect to smtp host : 10060 : A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
Please don’t press F5 / Refresh, just use the ‘general discussion’ link or press the back button in your browser( to avoid double posts ). Despite the error, your message does get posted 
