Yes, here's the reason people don't run their own servers!
> is not too difficult a setup to achieve...
Yes it is, for a lot of people. Not to mention security patches for all this software.
Add that to the fact that Google reportedly is reportedly aggressively classifying mail from new servers as spam (your point 2) and you greatly increase the transaction cost required for people to run their own mailservers.
Yes, here's the reason people don't run their own servers!
> is not too difficult a setup to achieve...
Yes it is, for a lot of people. Not to mention security patches for all this software.
Add that to the fact that Google reportedly is reportedly aggressively classifying mail from new servers as spam (your point 2) and you greatly increase the transaction cost required for people to run their own mailservers.