The link to SMTPQ says it's for 9.4.1, but it's actually for 9.4.0 http://www.chilkatsoft.com/downloads_misc.asp
I'm having problems with 9.4.0. It crashes after sending a couple of messages, and then I can't get the service to start until I clear the email queue out. I've downgraded that version to 9.3.1 (This was before I realised there was a more up to date version), and that seems to have fixed the issue.
I've looked in the log, but I can't seem to find what's causing the crashes. Thought you should know.
I'm happy to provide more information on this if you tell me where to look.
OK - I upgraded to 9.4.1, and that worked well. Looks like it's just the link on the website that is wrong: