Use a better email client.
Use a better email client.
Thunderbird
If you are asking if you can login to a webpage you want webmail: horde, squirrelmail, roundcube.. rainloop looks like gmail, Zimbra, mailspring (has undo send), Cypht, mailpile...
Browsers can't, and absolutely shouldn't, do everything.
Mailspring
What is very unusual here is that they are asking you if you want bigger ads, a slower experience, and recommend that you don't chose that option. There is also an ad free, paid alternative in the small print.
It is the opposite of what the usual suggestions are. Generally, the most predominant is the paid option, then the one with big ads, then the one with small ads.
The most probable reason here is that they want to show you that if you don't like integrated ads that look like emails, you can, but it will be terrible. Maybe it is a legal requirement or something.