So, one negative comment on ProtonMail so far.
I opted to purchase the "Proton Plus" package for around $135 or so annual fee. This is touted as having up to "five email addresses" as part of the package.
Well I was mentally thinking, ok, five email addresses, that will work; I need an address for me, one for Mrs. RJ, and we use one for common accounts or other things where we need to pool the info. I've set up this pooled address on several clients so we each have access to it. This approach works very well for us.
Protonmail doesn't operate that way. In fact, what they really should say is they have "five email aliases", which you can use with your (single) primary account. Yes, you can send email to "appear" as another email
address@protonmail.com, but they don't have a concept of an individual email account and storage for user 1, another for user 2, and so on. They just have one big pool of email for the "one" user.
So it's not like you are buying five separate emails. You really are buying one, with the option to "appear" or alias yourself with another email address.
I was not very happy with this. But since I've gone ahead and bought the package, what I ended up doing was to set up three incoming email filters. If the email filter contains "user 1" as the recipient, I moved the email to a folder called "user 1". Same for "user 2" and same for "user 3".
After setting up these filters, I installed the Protonmail Client on my wife's iPhone, and confirmed with some back and forth to gmail that this indeed does work. She has the same client I have, meaning she can see all "my" email, as I can see all "her" as well, and we can both see the "shared" email, each in their respective folders.
We are ok with this, as our relationship is transparent; we don't have a me/your financial relationship so everything is in one pot anyway (ok actually well I tell a lie: we share the money 50:50: I put it in, she takes it out
).
But if you were looking to get true "multi user" with the basic Proton Plus package, it won't do it.