SquirrelMail - Webmail for Nuts!

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PHP sets limits on how large attached files can be.  To change this limit, you need to edit the {{php.ini}} configuration file.  The values you will need to increase or decrease are:
*[http://www.php.net/manual/en/ini.core.php#ini.memory-limit memory_limit]
*[http://www.php.net/manual/en/ini.core.php#ini.post-max-size post_max_size]
*[http://www.php.net/manual/en/ini.core.php#ini.upload-max-filesize upload_max_filesize]

The values can be set in bytes (1,048,576 per MB) or they can be set in MB by appending the value with an "M", ie. 8M.

To upload large files, this value must be larger than {{upload_max_filesize}}. If memory limit is enabled by configure script, {{memory_limit}} also affects file uploading. Generally speaking, {{memory_limit}} should be larger than {{post_max_size}}. ([http://www.php.net/manual/en/configuration.php#ini.post-max-size])

You should also take into account limits for your MTA software:
* Courier-MTA: showconfig or {{/etc/courier/sizelimit}} - default 10MBytes
* Postfix: a configuration parameter called {{message_size_limit}} in the file {{/etc/postfix/main.cf}} sets the maximum size (in bytes) of the entire message - default: 10240000 - i.e. approximately 10MBytes
* Qmail-MTA:  a file in {{/var/qmail/control}} called databytes. The file contains one line that represents the max size of attachments in bytes.
* Sendmail: option !MaxMessageSize, usually unset; can be changed in mc file {{define(`confMAX_MESSAGE_SIZE',`5242880')dnl}}

Pay attention if you use any proxy server like Squid. In Squid, you need to change the {{request_body_max_size}}. The default is 1MB.
eg: {{request_body_max_size 10 MB}}

In some versions of squid this is called {{request_size}} rather than {{request_body_max_size}}.

And your HTTP server:
* Apache: You can restrict maximum file size using [http://httpd.apache.org/docs/mod/core.html#limitrequestbody LimitRequestBody] directive

search for {{/etc/httpd/conf.d/php.conf}} and comment out {{!LimitRequestBody}}

<code>
<Files *.php>
    SetOutputFilter PHP
    SetInputFilter PHP
#    LimitRequestBody 524288
</Files> 
</code>

RESTART Apache 2.0 - and you will be able to attach filesizes > 0,5M again.

!SquirrelMail in a first step try to stop user to submit attachment bigger than allowed using {{<input type="hidden" name="MAX_FILE_SIZE" value="1000">}} HTML code, which do not work with all browsers, but the question is: With which browsers work and with which do not work? Please report it here.
* Konqueror seems not to obey this limit.
* Mozilla seems not to obey this limit.
* Microsoft Explorer seems not to obey this limit.
so is there any working, or code is broken?
: '''kink:''' I think this is an error in the PHP documentation, because I couldn't find a single browser which does something with this limit.
: '''tokul:'''> Firefox (1.0 Debian Sarge) follows it, but interface can't rely on restriction that is controled by end user.

Related bug: [http://sourceforge.net/tracker/index.php?func=detail&aid=597206&group_id=311&atid=100311 no 597206]

Probably the problem with memory starvation with big files is not a !SquirrelMail problem but a PHP problem, seems to be solved since PHP 4.2.0, look at: [http://bugs.php.net/bug.php?id=17606 php bug 17606] (not sure anyway).

If you have any problems with this, see the PHP documentation at http://www.php.net/ (here's the relevent page[http://www.php.net/features.file-upload])

Problem noted on Red Hat 8.0/9.0 with Apache 2.0.x, the error "Requested content-length of 670955 is larger than the configured limit of 524288" was occuring under Apache and a "Page not found" would appear in the browser. Trying the above settings made no change with PHP, but on Red Hat 8.0/9.0 there is an additional PHP config file, {{/etc/httpd/conf.d/php.conf}, and increasing the number on the line {{!LimitRequestBody 524288}} solves the issue.

Gentoo Linux has a file like the above mentioned where the limits are set, the file is {{/etc/apache2/conf/modules.d/70_mod_php.conf}}.

As a side note, check the max execution time in {{php.ini}}. Very large attachments may take longer than the 30 seconds allowed. Symptoms may be found by looking at the httpd error log and seeing "httpd in free(): warning: recursive call" yet the httpd does not core fault and die altogether. For a 10 MB file attachment I set execution time to 120 seconds.

Gentoo Linux - Update - Actually, I did not find the {{*mod_php.conf}} file in Gentoo Linux had any of the above information.  I modified the {{/etc/php4/php.ini}} file as directed.  Though, I did find a link to this file in the apache directory under {{/etc/apache/conf/php.ini}}.

The file that needs to be adjusted in the Red Hat 9 configuration of Apache 2.x is in {{/etc/httpd/conf.d/php.conf}}. The paths given above are inaccurate, at least for Red Hat 9. This solves the Apache interference, but is not the only limiter on large files.

Gentoo Linux: After raising the above mentioned values to 10M in {{php.ini}}, you ''do'' need to change {{!LimitRequestBody}} in {{/etc/apache2/conf/modules.d/70_mod_php.conf}}! I put mine to {{2097152}}, which is equivalent to 2M. This way, I can limit ''each'' attachment file size to 2M while the message size is 10M.

IMPORTANT: You must restart Apache before any changes take effect.

After setting {{memory_limit}}, {{post_max_size}}, and {{upload_max_filesize}} to 100MB in {{php.ini}}, and setting {{!LimitRequestBody}} to 0 (unlimited), restarted the Apache, I found that {{file_manager}} was reporting that the maximum upload file size was 50MB. Is this hardcoded in?

----

Fedora Core 4:
I followed the above description and it worked.  But then my server started crashing.  It's crashed several times in the past two weeks.  I am forced to hard boot the box, which is a real pain in the ass given it seems to only happen when I'm out of the office.   So:  THIS FIX IS BUGGY IN FC4!!
EDIT: these configuration file changes can't cause a server failure. However, it's possible that your web server is crashing with big files. That would be very strange and a big bug in your web server, and both Apache 1x and 2x bundled with FC4 don't have any trouble there. If your server is hard crashing, there's something else wrong. Take a look at {{/var/log/messages}} or read the trace on the screen before rebooting.

Summary of change:
Add document to category:

Editing AttachmentSize