I've been using inbox eu for several months and it showed great results. Pretty cheap but I don't know if it has all the options you asked for in your post. The great advantage of it is the possibility to use VPN during work. Some e-mail providers sometimes block using VPN which is pretty dumb, IMHO. I personally use VPN almost all the time when I'm lurking on the web, so it's essential for me. Yesterday, I discovered a detailed
VyprVPN review that successfully explained to me all the advantages and disadvantages of their services. Well, I'm probably gonna choose between this VPN and NordVPN soon.