[imp] blank page when mail is bigger than 9M

[Andrea Zagli]

as the subject

when i click on a mail, to show it, that have a size bigger than 9M,  
imp returns, immediatly, a blank page

where can i search for parameters that limit imp? (php, apache,  
dovecot, imp, horde, etc.)

i didn't find errors in log files...

imp 4.3.10


thanks in advance