FWIW we use a very very large and popular third party service to handle our email newsletters there can be many factors that can cause you to not receive it:
1] The simplest solution, you're simply just not signed up. You can subscribe/unsubscribe on
our website here. 2] Your ISP/email provider bounced an email and your address was marked as non-deliverable. As soon as this happens your email address is suppressed and you'll stop getting new emails from us. This is to protect our sender score so we don't end up looking like a spammer in the eyes of the ISP. If we send an email after the ISP/email provider said 'this is a bogus email address, do not email me' it can have a negative impact on our sender score and the ISP is very likely to block all emails from us to their users.
3] You moved one of our emails to a 'spam' or 'junk' folder. Some email providers will treat this like a hard bounce/spam complaint back to the sender. If this happens your email address is suppressed and you won't get future mailings.
4] You never, never open our emails. If we send you lots of emails and you never open them we stop sending them to you as frequently. Its not that we don't like you, we're just not sure if you're still there. When this happens we don't wipe or suppress your address we just leave it in a special area and you might get an email from us every other month or so instead of weekly.
Anyway - if you're sure you signed up and still not getting emails from us feel free to drop a line to customer service and they can sync up with our marketing folks to find out what is going on.