I need a cert for the Peroxide app which allows me to access my ProtonMail account on the Raspberry Pi, since ProtonMail does not provide an arm64 client. The peroxide instructions mention obtaining a cert from Let's Encrypt. There's no mention of setting up a webserver or domain (I have neither). Is there a way to obtain a standalone cert for this situation? Thanks.
Do those instructions say to obtain the cert for your ProtonMail server?
Can you provide the link for the instructions you are following?
Because normally a client wouldn't need a cert. The mail server does.
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Hi @ssilvi, and welcome to the LE community forum 
In general, ACME clients can operate in a standalone mode.
Where they function as an HTTP service and are able to satisfy the HTTP challenge requests.
That said, the Internet would need to be able to reach your system via HTTP.
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Looks like OP is referring to this:
Which is a SMTP+IMAP bridge to ProtonMail's custom protocols, so effectively a mail proxy. The certs are needed for SMTPS/IMAPS.
Also:
Warning: This software has not been thoroughly reviewed for security. You should only use it if you know what you're doing. I strongly advise against running it on the open Internet.
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@Nummer378
Yes, that is the guide I am following. I was using Hydroxide (a similar app) but it won't maintain a connection to the servers and I am tired of going through the login process to generate a new password each time.
Update: I have learned that ProtonMail Bridge will export the cert.pem and key.pem files. I still can't make Peroxide work, but that's a discussion for some other forum. Thanks for the help.
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