report memory errors

[macondo96]

Hello,
I've imported my email that i previously had been sending from roundcube to gmail. Most of the email i've imported seems to be lost - but the memory seems to have them (because has now taken 30%) of it - it's around 800 emails. Why so, and how do i fix it?
How do i check that roundcube will not send anymore (automatically the incoming email to that gmail account)?