I am pretty interested in the Gmail alternative / run your own mailserver threads. Gmail simply lacks the "WOW!!!" it had when I first signed up.
A few other issues that have had me looking for alternatives:
* False choices for new tech. If don't say Yes to transitioning to something like Google Hangouts, they make it really easy for you to push the button that says yes to hangouts.
* Google Apps for Business is pretty expensive when I actually see how people use it. 9/10 it is just for them to have the Gmail interface with their own domain. A lot of people forget that Google Docs exists until they accidentally click the "Open in Drive" or whatever.
* Spam protection has degraded with time. I receive more junk mail now then ever before. I think part of the email is because of the next bullet
* Wrong emails happen very frequently. Probably 2-3 times a week for me I receive a wrong email from someone thinking they own my Gmail account. It has happened three times with Apple purchases alone. A custom domain would help mitigate this. These aren't malicious. They have my last name, but a different first name, but we have the same initial so I can easily see how they mess it up. Also the majority of people still don't realize the Gmail + sign trick or that periods don't matter.
* Lack of features. You added tabs? Thanks, ummm, I guess. Thank you for putting that in the Promotions tab when before every semi-clever person already had a filter set to move things like that into their own "Promotions" tab. That's the big innovation?
In other words, almost everytime I check ShowHN I'm hoping for a new Gmail.