Loosing emails

[Zaichik]

I've lost a load of mine over the last 2 days.
Yesterday, 3 new mails appeared and within 3 secs, 2 just vanished.
This morning, about 8 existing ones were there. Half an hour later, all gone.

Not sure as well why my phone gets some emails my pc doesn't (no spam filters) and vice versa.

This is exactly what's happenng to me. It's definitely nothing to do with syncing on my PC because I don't download mail from this account on my PC or any other device. And sent items disappear as well.