throttle | Linux Web Hosting, DevOps, and Cloud Solutions

iRedMail is:
1. A ZERO COST, fully fledged, full-featured mail server solution. All components are free and open source software
2. It support unlimited domains and email accounts.
2. SpamAssassin, ClamAV, SPF, DKIM, greylisting, whitelisting, blacklisting.
3. Stores mail accounts in your favorite backend: OpenLDAP, MySQL, MariaDB, PostgreSQL.
4. Supports major Linux distros

Throttling

iRedmail supports following level of throttling for email limits.
Global, per-domain and per-user throttling based on: max size of single message, number of max inbound/outbound messages per time unit.

iRedmail uses a component named iredpad for this. With iRedmail Pro version, you can configure these settings through GUI(iRedadmin panel). However they are not available through GUI for free version. The feature is enabled though we will have to modify them through database directly.

So the database is “iredapd” and table is “throttle”.

Here are some examples

1. Allow user `user@domain.com` to send 50 mails in 5 minutes (period=300):

INSERT INTO throttle (account, kind, priority, period, msg_size, max_msgs, max_quota) VALUES (‘user@domain.com’,’outbound’,100,300,0,50,0);

2. Set global limit of 500 mails per day and a maximum single mail size of 55MB

INSERT INTO throttle (account, kind, priority, period, msg_size, max_msgs, max_quota) VALUES (‘@.’,’outbound’,0,86400,57671680,500,0);

57671680 bytes = 55MB
86400 – 1 Day

# Technical details of throttle plugin
# ————-
#
# Currently you may throttle based on:
#
# – amount of mails sent over a given period of time
# – accumulated mail size sent over a given period of time
# – size of singe message
#
# Eg: You can enforce that user@domain.com does not send more than 1000 mails
# or 1GB of mail (whichever limit is hit first) in 5 minute.
#
# Possible throttling address:
#
# *) Full email address: user@domain.com
# *) Domain name (with a prefixed ‘@’): @domain.com
# *) Sub-domain name (with a prefixed ‘@.’): @.domain.com
# *) IP address: 192.168.1.1
# *) IP network: 192.168.1.*
# *) Catch-all for email address: ‘@.’ (note, the dot is required)
# *) Catch-all for IP address: ‘@ip’
#
# Priorities of different thorttle address (larger digital number has higher priority):
#
# *) email: 100 # e.g. ‘user@domain.com’. Highest priority
# *) wildcard_addr: 90 # e.g. `user@*`. used in plugin `amavisd_wblist`
# # as wildcard sender. e.g. ‘user@*`
# *) ip: 80 # e.g. 173.254.22.21
# *) wildcard_ip: 70 # e.g. 173.254.22.*
# *) cidr: 70 # e.g. 173.254.22.0/24
# *) domain: 60 # e.g. @domain.com
# *) subdomain: 50 # e.g. @.domain.com
# *) top_level_domain: 40 # e.g. @com, @org
# *) catchall: 0 # ‘@.’. Lowest priority

Please note that priority for global setting is 0 and priority of a single user is 100.

If you use the rsync utility to keep your backups synchronized between your servers or with a local machine, you might want to prevent the script from using too much bandwidth. However, rsync makes a lots of network I/O. The point of limiting bandwidth is to make sure your backup scripts don’t clog up the network connection.

Naturally, limiting the amount of bandwidth your backups are using is going to make them happen more slowly, but if you can deal with that, this is the way to do it.

Normal rsync command

rsync –avz -e ‘ssh’ /path/to/source user@remotehost:/path/to/dest/

What you’ll want to do is use the –bwlimit parameter with a KB/second value, like this:

rsync –bwlimit=<kb/second> –avz -e ‘ssh’ /path/to/source user@remotehost:/path/to/dest/

So if you wanted to limit transfer to around 10000KB/s (9.7MB/s), enter:

rsync –bwlimit=10000 –avz -e ‘ssh’ /path/to/source user@remotehost:/path/to/dest/

Example:-

rsync –bwlimit=10000 –avz -e ‘ssh’ /backup/ root@192.168.0.51:/backup/

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Tag: throttle

Email sending limits and throttling – iRedmail free edition

Limit /throttle rsync transfer speed