I recently migrated from MailChimp to SendGrid. Reason is the MC customers support reall sucks ... they just simply suspended my account when my subscribers reaches over 100k ... no I'm not a spammer, i have been sending email to over 100k subscribers for many months using their API (by synching in / out), so when i finally decided i have the money to upgrade to their 100k monthly plan, so i dont have to sync in / out of their API (previously 20k plan) ... guess what is the reward? They decided to suspend my account .. WTF???

Did you ask them why?

I think it auto triggers their threshold checker ... becoz it must be suspicious that my subs jump from 20k to over 100k ... but i have explained that to them ... plus they have a string of interrogation questions i have to answered ... i have been a loyal customer for over many years ... and they just suspend me over the Christmas weekend ... it took them 3-4 days to just reply me and finally many email bouncing back and forth ... i had enough ... i just paid over $1000 / month to get treated like this!!!

We had the same experience with them. Moved as well.

Does it seem weird to anyone else that "sending emails" is suddenly a money-making venture? Have our spam detectors gotten so screwed up that this is the only way to guarantee delivery?

Yes I tried setting own mail server but will never be able to get pass gmail, yahoo mail, etc spam filters. Had to give up and pay these ESP at the end.

Does anyone know if SendGrid plans on improving their incoming parse a la Mailgun and Postmark (http://news.ycombinator.com/item?id=3475308)?

We use SendGrid but have been thinking of switching to Mailgun for awhile for their incoming parse service.