Our plans at Communiteq (formerly DiscourseHosting) include outgoing mailservers with a good reputation, as well as a POP3 mailbox for incoming mail, for no extra cost.
On the Professional plan and up, we can also configure your own or a third party mail service if you really want to.
We will install the topic list previews plugin on the Professional plan and up. Setup is free and you get 5 plugins of your choice next to the standard plugins (Akismet, Slack, Solved, Adsense, Patreon, Sitemap, Data Explorer and Staff Notes).