I've noticed if attachments are a bit larger they do get sent but the sender is left there with the message "Sending message..." on the top of the screen. He has to go back to the root of the webmail in order to continue. Also the server load goes up a lot. Also it takes ages for the message to actually reach the SENT folder.
One of the things I noticed while trying to solve the problem is that if I set $rcmail_config['sent_mbox'] = ''; so it doesn't store messages it goes threw normally, but then the message isn't saved, that's not good.
Then I went to check the logs
[22-Dec-2009 00:42:02] PHP Fatal error: Maximum execution time of 120 seconds exceeded in F:\www\*hidden*\webmail\program\lib\imap.inc on line 245
Not sure if it's from sending attachments, I just noticed it and did no further testing.
php.ini
upload_max_filesize = 1000M
post_max_size = 1000M
max_execution_time = -1
.htaccess
php_value upload_max_filesize 10M
php_value post_max_size 12M
php_value memory_limit 256M
The size of the files I was trying to send was about 6MB. Smaller files get sent with no problems.
Than's in advance,
Tom
PS: After about 2 minutes, after clicking send it does however send you to the main page. But that takes just to long.
PS: A pretty big discovery if one can say so, I just noticed that if I send a mail over Thunderbird it is copying the message to Sent folder for AGES. I think this is the Hmailserver, there's something up with that.