Yet another +1 for Fastmail. Long time customer when I got sick of running my own IMAP/SMTP about 5+ years ago. It has IMAP, CalDAV, CardDAV. It has a snappy a

Yet another +1 for Fastmail. Long time customer when I got sick of running my own IMAP/SMTP about 5+ years ago. It has IMAP, CalDAV, CardDAV. It has a snappy and responsive web interface and their iOS app is equally as good. They have configuration of profiles for MacOS and iOS down (I can't talk to other environments). I have a bunch of domains doing email through there, but I run my own DNS. I had a need to configure things that Fastmail's DNS doesn't deal with (IPv6 etc) but for general use, it's great. Properly configured SPF, DKIM, DMARC, good spam filtering, easy contact managenment etc.