check your error log. i think you will see an out of memory error like this http://roundcubeforum.net/forum/index.php?topic=1811.0

I have made a sensational discovery (:-):

With Firefox there's no problem to send emails with greater attachments. The upload is very big, the max_execution_time from 120s is sufficient. The problem happens in my environment only with Opera 9.22. With Opera it's not possible to upload attachments greater than (apr.) 200K. Its mysterious! The same OS on client-side, the same mailserver, the same preferences in both browsers (esp. proxy server) ...


Here is my .htaccess:
Best regards,
Heidrun

here is my input:

i've been struggling with the same problems the last day and at last took the time to read all the error logs.

I'm using WinXPSP2x64, Opera9.23, RC-0.1RC-2, hMailServer, Apache2.2.4/php5.2.4, MySql5

php memory exhaust etc. is solved by editing in php.ini and .htaccess-files (plural!) AND the mailserver settings!;

things i checked:
first off, roundcube\config\db.inc.php, main.inc.php
$rcmail_config['db_max_length'] = 81920000; (dont actually know how much this helps with basic settings...)
$rcmail_config['debug_level'] = 4; (good for debugging!)
$rcmail_config['enable_caching'] = FALSE;
$rcmail_config['default_host'] = '<hostname>';
$rcmail_config['default_port'] = 143;
$rcmail_config['username_domain'] = '<hostname>';
$rcmail_config['smtp_server'] = '<hostname>';
$rcmail_config['smtp_port'] = 25;
$rcmail_config['smtp_user'] = '%u';
$rcmail_config['smtp_pass'] = '%p';
$rcmail_config['smtp_auth_type'] = ''; (leave empty!!)
$rcmail_config['session_lifetime'] = 10;
$rcmail_config['des_key'] = 'rc.rc-2!24ByteDESkey*Str';

php.ini
safe_mode = Off
file_uploads = On
upload_tmp_dir = "<some existing absolute path>"
upload_max_filesize = 128M
error_reporting = E_ALL (good for debugging!)
post_max_size = 32M
extension=php_imap.dll
extension=php_openssl.dll
SMTP = <mail server hostname>
smtp_port = 25
sendmail_from = <your email address?>
sql.safe_mode = Off
session.save_path = "<some existing absolute path>" (unsure of this one)
max_execution_time = 600
max_input_time = 600
memory_limit = 128M

roundcube\.htaccess
AddType text/x-component .htc
<IfModule mod_php4.c>
php_flag display_errors Off
php_flag log_errors On
php_value error_log logs/errors
php_value upload_max_filesize 128M
php_value post_max_size 32M
php_value memory_limit 128M
</IfModule>
<IfModule mod_php5.c>
php_flag display_errors Off
php_flag log_errors On
php_value error_log logs/errors
php_value upload_max_filesize 128M
php_value post_max_size 32M
php_value memory_limit 128M
</IfModule>
<FilesMatch "(\.inc|\~)$">
Order allow,deny
Deny from all
</FilesMatch>
Order deny,allow
Allow from all

roundcube\logs\.htaccess, roundcube\temp\.htaccess
Order allow,deny
Allow from all (dangerous?)

hMailServer Administraror: Domain\<mailserver>\Limits
Maximum Size: 1000 MB
Maximum Message Size: 64000KB
Maximum Account Size: 100MB
hMailServer Administraror: Settings\TCP/IP Ports
SMTP: 25
IMAP: 143
hMailServer Administraror: Settings\Protocols\SMTP\Delivery of e-mail
hostname: <yourownhostname>
SMTP Relayer: <ISPs smtp hostname> (often isp wont allow client to send mail directly)
+authentication if required...

another way is ofcourse to let php send mail via isp and not through local smtphost - but not fun!
that is done by setting the smtp host in php.ini
--this is ofcourse the only way if you dont have your own smtp server



there... excuse the overkill, but it's time you guys solved this and to illustrate the various settings that might cause the "unexplained" behavior. for example, even if your htaccess and php.ini says it's ok, your mail server might not allow large files. READ YOUR LOGS!

i have excluded the sql settings to somewhat limit this post size, and it doesnt seem to be an issue for anyone here...

cheers!