For whatever reason, spamgourmet isn't getting emails from samsclub.com. I just signed up for a membership with a SG address and I never got any of the emails that would have been associated with setting up a new account. I know that I never got a message from them because I sent a test message from my work email to that same address and it came through just fine (as the first message to that address.) I think that this has been happening for a long time because last year I ended up having to switch my email to gmail in order to get messages from Sam's.
Does anyone have any ideas as to why this is happening?