I also didn't get a mail through SG for a couple of days. I'm not quite sure if I fully understand from the previous posts what's going on.
- is there really a blacklisting? Are all SG-domains affected?
- will the situation (whatever that situation is) get better?
- if SG gets usable again, will these missing mails only be delayed or are they lost?
- is the situation that bad that you would recommend to change the used addresses to others (non SG)? (No offense, I just want to keep my email working)