There are currently some issues with the ability to send emails from a client (SMTP).  Webmail appears to be fully functional.  We are looking into the situation and will keep everyone updated as we go.
This is also affecting our ability to send emails, as such we are currently unable to respond to help tickets.  Please know that we are still reading them as they come in and and working to get this resolved as fast as possible.  We will reply as soon as we are able.
Many apologies for the inconvenience.