Poor on iPhone
I have had this app on my iPhone for several years. It is absolutely hopeless. It does not reliably open up and regularly stalls or fails to open at all to give access to emails. Even the main website on my laptop has substantially deteriorated and has regular glitches. It also regularly blocks emails sent to me which don’t even make it to spam folder so I’m forever having to manually whitelist them. I use my doctors.org.uk email for so much it’s too late to stop using it unfortunately.