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Mail attachment size is configured in multiple places with default iRedMail settings:
Postfix is MTA, so we have to change its setting to transfer mail with large attachment.
For example, to allow mail with 100Mb attachment, please change both
message_size_limit
and mailbox_size_limit
settings like below:
# postconf -e message_size_limit=104857600
# postconf -e mailbox_size_limit=104857600
Note
mailbox_size_limit
(size of the mailbox)
MUST be equal to or LARGER than message_size_limit
(size of single email
message).mailbox_size_limit
setting is not used, but we still
need this setting to surpress Postfix warning while starting Postfix
service.Restart postfix to make it work:
# /etc/init.d/postfix restart
NOTES:
104857600
is 100 (MB) x 1024 (KB) x 1024 (Byte).mailbox_size_limit
is smaller than message_size_limit
, you will get
error message in Postfix log file like this: fatal: main.cf configuration
error: mailbox_size_limit is smaller than message_size_limit
.If you use mail clients such as Outlook, thunderbird to send mails, it's now ok to sent large attachment with above setting.
- iRedAPD is a Postfix policy server developed and maintained by iRedMail team.
- With default iRedMail setting, no message size limit is set.
- For more details, please check tutorial: Manage iRedAPD.
With plugin throttle
enabled in iRedAPD config file (/opt/iredapd/settings.py
),
iRedAPD will query throttle settings from SQL database (SQL table iredapd.throttle
),
if there's a global, per-domain or per-user message size limit set for sender
or recipient, it will performs the check.
Both Postfix and iRedAPD check the size of single message, if the message size reaches the limit of either Postfix setting or iRedAPD throttle setting, the email will be rejected.
You can set the throttle with iRedAdmin-Pro, or with SQL command tool, for more details, please check plugin source file, it's detailed with examples and explanation: Throttle plugin.
If you have Roundcube webmail, please change two more settings:
Please also update PHP config file php.ini
to allow uploading large file:
/etc/php.ini
/etc/php5/apache2/php.ini
./etc/php/7.0/apache2/php.ini
for Apache, or /etc/php/7.0/fpm/php.ini
for Nginx + php-fpm./usr/local/etc/php.ini
for Apache, or
/etc/php5/fpm/php.ini
for Nginx./etc/php-5.4.ini
. If you're running different PHP release,
the version number 5.4
will be different.memory_limit = 200M;
upload_max_filesize = 100M;
post_max_size = 100M;
Roundcube uses its own setting max_message_size
to limit message size, please
add or update this parameter in its config file:
/opt/www/roundcubemail/config/config.inc.php
.
Old iRedMail releases use /var/www/roundcubemail/config/config.inc.php
./opt/www/roundcubemail/config/config.inc.php
.
Old iRedMail releases use /usr/share/apache2/roundcubemail/config.inc.php
./usr/local/www/roundcubemail/config/config.inc.php
/opt/www/roundcubemail/config/config.inc.php
.
Old iRedMail releases use /var/www/roundcubemail/config.inc.php
.$config['max_message_size'] = '100M';
Change same settings in file .htaccess
under roundcube root directory:
/var/www/roundcubemail/.htaccess
/usr/share/apache2/roundcubemail/.htaccess
or
/opt/www/roundcubemail/.htaccess
./usr/local/www/roundcubemail/.htaccess
/var/www/roundcubemail/.htaccess
Note: this .htaccess
file may not exist on some Linux/BSD distributions,
if it doesn't exist, you can skip this step.
php_value memory_limit 200M
php_value upload_max_filesize 100M
php_value post_max_size 100M
Restart Apache or php-fpm service to make it work.
Find setting client_max_body_size
in Nginx config file
/etc/nginx/conf-enabled/client_max_body_size.conf
, change the size to a
proper value to match your need.
Attention
Old iRedMail releases set this parameter in /etc/nginx/nginx.conf
.
client_max_body_size 100m;
Reloading or restarting Nginx service is required.
SOGo config file is /etc/sogo/sogo.conf
(Linux/OpenBSD) or
/usr/local/etc/sogo/sogo.conf
(FreeBSD), 2 settings are relevant to message size:
WOMaxUploadSize
to limit upload file size.SOGoMaximumMessageSizeLimit
to limit single
message size. // set the maximum allowed size for content being sent to SOGo using a PUT or
// a POST call. This can also limit the file attachment size being uploaded
// to SOGo when composing a mail.
//
// - The value is in kilobyte.
// - By default, the value is 0, or disabled so no limit will be set.
WOMaxUploadSize = 102400;
// Parameter used to set the maximum allowed email message size when
// composing a mail.
// The value is in kilobytes. By default, the value is 0, or disabled so
// no limit will be set.
SOGoMaximumMessageSizeLimit = 102400;
Restarting SOGo service is required if you changed any setting in SOGo config file.
Outlook has its own attachment size limit, and will raise error like The
attachment size exceeds the allowable limit.
To modify the default attachment limit size in Outlook on Windows system, follow these steps:
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\Preferences
Add the following registry data under this subkey:
Notes:
Exit Registry Editor