I looked into SendGrid, and I was a bit concerned that they use IP addresses from EC2 to send out email with. Otherwise they seem pretty good. I wonder if the

I looked into SendGrid, and I was a bit concerned that they use IP addresses from EC2 to send out email with. Otherwise they seem pretty good. I wonder if the issues of needing to send out mail from multiple IP addresses and per-ISP rate throttling are as important as they say. I guess I'll find out if I'm lucky enough to ever hit those limits.