Disclaimer - I have no affiliation with Fastmail. Just a very happy customer.
In my experience so far, Fastmail has a ridiculously smooth and fast web-UI. The sidebar feature they have is instant and way faster than the equivalent version on Gmail/Outlook.
Plus, they follow open standards very well, so it works seamlessly with Thunderbird and iOS (for email, contacts AND calendar syncing). They even have a built-in Notes client which syncs with Notes app on iOS.
Also, they sync gmail/icloud/outlook etc. email/calendars/contacts [1] over seamlessly and extremely quickly. So, if you have multiple email accounts, configuring receiving/sorting/sending emails using the FM UI is a breeze.
It also has a very good collection of customisation options for rules, folders etc. which makes sorting your emails a very efficient and seamless process.
Finally, and probably most importantly, it has a beautiful dark mode, with dark email background. The contrast is just right.
I would be remiss if I didn't mention the insane speed+smoothness of the web client again. It is, quite frankly, ridiculous.
[1] - Outlook Contacts/Calendar syncing doesn't work directly since MSFT doesn't support the required APIs (this is the warning FM shows you when you try).
In my experience so far, Fastmail has a ridiculously smooth and fast web-UI. The sidebar feature they have is instant and way faster than the equivalent version on Gmail/Outlook.
Plus, they follow open standards very well, so it works seamlessly with Thunderbird and iOS (for email, contacts AND calendar syncing). They even have a built-in Notes client which syncs with Notes app on iOS.
Also, they sync gmail/icloud/outlook etc. email/calendars/contacts [1] over seamlessly and extremely quickly. So, if you have multiple email accounts, configuring receiving/sorting/sending emails using the FM UI is a breeze.
It also has a very good collection of customisation options for rules, folders etc. which makes sorting your emails a very efficient and seamless process.
Finally, and probably most importantly, it has a beautiful dark mode, with dark email background. The contrast is just right.
I would be remiss if I didn't mention the insane speed+smoothness of the web client again. It is, quite frankly, ridiculous.
[1] - Outlook Contacts/Calendar syncing doesn't work directly since MSFT doesn't support the required APIs (this is the warning FM shows you when you try).