The primary advantage is encryption/security, the overall privacy business model that Proton brings to the table. This is diametrically opposite of the Google-gmail approach, where Google owns your data, has no problem mining, using and/or sharing it, in spite of what they "promise." With Proton, what's mine is indeed mine, and they honor and respect my privacy and ownership rights to my own data (emails). Review collected by and hosted on G2.com.

The Proton Email Client (either in-browser or standalone-app) is the weakest link here. This essential tool (how else to read/create/manage your email?) needs serious attention and re-engineering from Proton. Yes, I "could" use Mozilla Thunderbird, or some other client, via the Proton Bridge. But... I don't want to. Hope that someday (soon) Proton Email Client gets: adjustable-size fonts (current fonts are tiny for old eyes), better folder/subfolder management and utility, a better email writer (more text features), and more. Looks like the Proton User Forum is full of great suggestions directly from users, but not much software (feature/enhancement) development seems to be going on... Is Proton committed to the user experience too? Review collected by and hosted on G2.com.

I find the user interface to be very user friendly. When I am juggling multiple tasks the last thing I want to do is fumble with an overly complex email user interface. Proton Mail delivers a simple to use format, easy to search and find archived emails and it is consistent from my phone to my laptop. Review collected by and hosted on G2.com.

My only dislike is that I have not been able to find a way to migrate one of my employees email accounts over from another service provider without risking to loss of several years of archives embedded in his email software. I can use Proton Bridge to bring his email files over on his laptop but unfrtunately Proton Bridge does not work on his mobile device so he stuck using a different email service provider. Review collected by and hosted on G2.com.

I like that ProtonMail gives my business a professional email platform without handing my data over to Google or another company that mines it for advertising. Review collected by and hosted on G2.com.

The only real drawback I have noticed is that calendar invites can be a little clunky because I sometimes have to download the ICS file and manually add it to my calendar. Review collected by and hosted on G2.com.

Very user friendly. Easy to create/organize labels and folders. Easy to find account info and settings. Great for prioritizing current clients and also referencing past conversations with previous clients. Love that emails are encrypted. I trust that Proton is not selling my data. Spam detection is great. Review collected by and hosted on G2.com.

Not being able to search for words/phrases within emails. The search function only allows searching the subject line, sender, and receiver. Review collected by and hosted on G2.com.

I most value that my content is not mined to target me for ads, that the AI feature doesn’t insert itself, uninvited as I am writing and that if I were to use AI, my content doesn’t feed back to train an LLM. I also love the ease with which I can encrypt messages. Lastly, messaging with the Proton name in my address communicates to patients and colleagues that I actively support our right to have private lives free from covert and overt surveillance Review collected by and hosted on G2.com.

I don’t think they offer a BAA, so I don’t use their drive to store PHI. I don’t include patient identifiers in messages containing health information on any email platform, so that’s not a downside for me about Proton. Review collected by and hosted on G2.com.

Proton's end-to-end encryption model is technically sound, and their commitment to Swiss privacy law and zero-access architecture is genuine. The core email product is reliable, and the privacy-first approach is exactly what organizations handling sensitive communications need. The product itself is not the problem. Review collected by and hosted on G2.com.

Proton's enterprise support structure is fundamentally broken for business customers. I made eight formal escalation requests over several weeks, asking to be routed to someone with commercial authority. Every request was absorbed by the support tier and never executed. I requested escalation to the Proton Foundation and executive leadership no fewer than eight times. Every request was acknowledged and ignored.

When I located their enterprise email address and sent a detailed inquiry describing a potential 50-seat Workspace deployment worth between $7,794 and $11,994 per year, I gave their enterprise team six full business days to respond. They said nothing.

The core issue is that when Workspace launched, Business Suite customers were migrated automatically at no cost. Legacy Business customers — despite having functionally identical product access — were told to upgrade manually, thereby terminating their paid subscriptions early and forfeiting a lifetime discount. The financial difference was approximately $6 per year. Proton chose to ignore a potential $11,994 annual contract rather than bridge an $11 gap over the remaining 22 months of a paid subscription.

The support agents acted in good faith within their authority. The failure is structural. There is no functional path from a legacy business customer to anyone with commercial authority at Proton. Review collected by and hosted on G2.com.

It doesn't have ALL the features that Gmail or Outlook has, but it has all the important ones I need. I can reassure my clients that I take THEIR privacy seriously as well as their company privacy and security seriously. They (my clients) are reassured that their information is not being sold and their data is not being used or abused and is less likely to be hacked than on one of the Big Tech companies. Review collected by and hosted on G2.com.

It doesn't have all the plug-in integrations that I would like. For instance, it doesn't automatically log 'sent' items in my CRM.

Also, I have had some clients where my email ends up in their spam folder. That might not be the fault of Proton though. Review collected by and hosted on G2.com.

I have access to multiple emails for custom domains for my business and Proton Drive to store information without worrying about data mining. Review collected by and hosted on G2.com.

I have held off on Proton Pass Manager because of the reviews of how well it functions for auto-fill and some websites. Also, it has lacked an emergency contact or digital heir feature to pass on data in case of an emergency, although it seems some things have been updated and will be worth trying now. The end-to-end encryption is not accurate when sending to non-Proton emails.

I wish the Proton was integrated with more 3rd-party business software. Mail and Calendar could also be more user-friendly when organizing filters and events - it can be a big time suck. Review collected by and hosted on G2.com.

Proton Mail combines strong privacy and security with an interface that’s genuinely easy to use day to day. Its end-to-end encryption and other privacy-focused features give me confidence that my data stays protected, and the apps themselves feel polished, fast, and reliable. I also appreciate that Proton is transparent about its mission and clearly puts user privacy first, rather than leaning on advertising or data collection. On top of that, the integration with the broader Proton ecosystem is a major plus and makes the overall experience feel more cohesive. Review collected by and hosted on G2.com.

Honestly, there isn’t much to dislike. Still, some of the more advanced features and integrations can feel a bit limited compared with long-established providers like Gmail or Outlook. Even so, I think the tradeoff is worth it: stronger privacy and a cleaner experience that feels far less ad-driven. Review collected by and hosted on G2.com.

I really appreciate Proton Mail For Business for its secure email, great integration, and easy-to-use calendar. It makes scheduling meetings effortless, and I can respond to emails quickly and securely. I like that I don't have to rely on Google or Microsoft for everything, and I prefer working with Proton. Their customer service is top-notch, and setting it up was a perfect 10 out of 10. Review collected by and hosted on G2.com.

I think they could work on remembering my e-mail rules better. When I put things in the trash, I wasn't meaning for the e-mails to be considered spam. Review collected by and hosted on G2.com.