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It's going to be difficult to have all of those features.

Protonmail is kind of the go-to, and it is free. When the recipient tries to read it, it will launch a new page for them to log in to. It's so secure that you can't even search your own e-mail. But it does ask you to integrate existing contacts, which I don't like (you can always tell it no, but still). If you get your contacts to sign up for ProtonMail, you may be able to exchange e-mails without a password and still have end-to-end encryption.

Here is one option to consider:

https://www.startmail.com/en/

The reason that I recommend this service is because I know some of the people involved. Granted, it has been 15 or 16 years, but I have spoken to these people in person before StartMail was even a concept. One of the founders was co-author of a book called "SpyChips," which chronicled some of the dangers to our security and privacy by RFID chips. Unlike ProtonMail, your mail is searchable. IMAP is disabled by default. You can encrypt and sign the e-mail if you want - you have total choice on whether the e-mail is sent encrypted or not. You will have to find a secure way to transmit the password to your intended recipient. It is $60 a year whether you pick the personal or professional plan has the most features, but limits you to 1 email per year - the professional plan. It doesn't launch another webpage when the recipient opens the mail like Protonmail does.

Here is the latest PC Magazine review:https://www.pcmag.com/reviews/startmail?test_uuid=03GdTca9yYczB0udADO47Ac&test_variant=b- they don't provide details like they used to.

You can check your local yellowpages.com for email service providers and call around first to see what security features they offer. You would have a less-global email server. Most of the providers in my area have gone out of business, and they tend to be expensive, but could be a good option depending on what features they offer. Some of these companies can advise you on ways to set up your own email server at home, but that is a lot of work.

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Starting to look at email security. Looking for guidance - Encryption Methods and Programs - BleepingComputer