iPhone deletes email message before it is opened.
I use Apple Mail on my iPhone and on a new MacBookAir. Since I got the MacBookAir last week and migrated everything from the old computer, emails arrive on the phone and I can see the name of the sender and the title of the message - but they disappear before I can read them. OR if I open them fast enough and read them, the message disappears shortly thereafter - and definitely as soon as a new message comes in. The disappearing messages do not go to either trash or junk on my phone. The email messages arrive and stay on the laptop, as usual. I have reviewed all the settings on my phone, but do not see any obvious issues. Please help. Thanks!
iPhone SE, iOS 15