You can follow issues, downtimes and scheduled maintenance work at https://state.disroot.org You can signup for updates via email, or rss feed. We also post automatically the same information via mastodon, diaspora, hubzilla, xmpp and matrix chats.
In coming week or so we will also provide uptime information on all services on https://state.disroot.org so you could see what is the general uptime.
@idnovic If you have cases of emails not arriving (due to greylisting) it's good to report those to us via support_at_disroot.org so we can whitelist them. It's usually in cases when email is re-sent from different server each time and thus continuously being rejected.
More on greylisting https://postgrey.schweikert.ch/
Also disroot email (or any service for that matter) is our (disroot admins) main service (like main email, chat, social network, file storage) used. This means we are also disroot users and rely on the services being operational as much as any other users. So it is in our best interest to have those services running.