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Already edited post and upload size at php.ini , but i dont know where to edit the default 5MB limit for roundcube. I have to import 600mb mail account.
Usually that should be enough. Double check if you edited the right php.ini
Does it work if you set a override setting in file /usr/share/apache2/roundcubemail/.htaccess?
"php_value max_file_uploads 30"
php_value upload_max_filesize 700M
php_value post_max_size 700M
And change /etc/php.ini OR /etc/php5/apache2/php.ini
memory_limit = 200M; (Maybe more if it's a big upload???)
upload_max_filesize = 700M;
post_max_size = 700M;