Spam filtering
What's the problem?
Many people have signed up to the updates mailing list using a Hotmail or Yahoo mailaddress, or a similar web-based email service. These services have spam filtering features to reduce the junk mail ('spam') getting to your inbox, but this may also block emails from the psyclick updates mailing list.
Thankfully, you can specify mailing lists and email addresses that are 'safe', so they will not be filtered out. It's quick and easy to do, and I would recommend it to ensure you receive updates about psyclick.
How do I fix it?
I have put together step-by-step instructions on how to set up Hotmail, and similarly for Yahoo mail.
Other mail providers should have similar systems. Safe lists may also be known as 'whitelists' (opposite to 'blacklists'):