Fastmail is great, their android app is also great except one single thing. They for some obsure reason insist on opening attachments like pdfs inside the app instead of in the default app. But the problem is that they don't support opening password protected pdfs. And they shows an error that they dont support password protected files without providing an option to open in default app. I have to manually click on the file, read the stupid error, click the download button(this is available only in the error page), then use the notification bar to open the damn file on my phone.
Everything else is fine. This one sketchy insistance to open every file themselves within the app even if they dont know how to do that is something that annoys me.