Faruque Ahmed : MCP, MCSA, MCSE, MCTS, MCIT, CCNA, OCA, OCP, GCP

Rate Limits

LLRate limit of 100 emails per hour per user in Postfix on Ubuntu 24

# apt install policyd-rate-limit

systemctl enable policyd-rate-limitsystemctl start policyd-rate-limit

# vi /etc/policyd-rate-limit.conf

[ratelimit]default_limit = 100/1h

# systemctl restart policyd-rate-limit

default_limit: This sets the default rate limit for all users. Here, it allows 100 emails per hour (100/1h).

# vi /etc/postfix/main.cf

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_policy_service inet:127.0.0.1:10031

# systemctl restart postfix policyd-rate-limit

(Optional) Customize Rate Limits for Specific Users

# vi /etc/policyd-rate-limit.conf

[ratelimit]default_limit = 100/1huser:john@example.com = 50/1huser:jane@example.com = 200/1h

# systemctl restart policyd-rate-limit

Verify Enforcement

Use the policyd-rate-limit command-line tool to check the current rate limits and usage:

# policyd-rate-limit-cli stats

firewall-cmd --add-port=10031/tcp --permanentfirewall-cmd --reload

XXXXXXXXXXXXXXXXXX------XXXXXXXXXXXXXXXXXXXXXX
how To limit users to sending 100 emails per hour in Postfix ubuntu 24

Step 1: Install postfix-policyd

postfix-policyd is a policy daemon that helps enforce rate limits.

apt updateapt install postfix-policyd

Enable and start the service:

systemctl enable postfix-policydsystemctl start postfix-policyd

Step 2: Configure postfix-policyd

Edit the configuration file:

nano /etc/postfix-policyd.conf

Find the [limits] section and set the hourly email limit:

[limits]per_hour = 100

Ensure sender tracking is enabled:

[sender]track = sender

Save and exit (Ctrl + X, then Y, then Enter).

Restart postfix-policyd:

systemctl restart postfix-policyd

Step 3: Integrate postfix-policyd with Postfix

Edit the Postfix main configuration file:

nano /etc/postfix/main.cf

Find and modify smtpd_recipient_restrictions:

smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated check_policy_service inet:127.0.0.1:10031 reject_unauth_destination

Save the file and restart Postfix:

systemctl restart postfix

Step 4: Test and Verify

Check the mail logs to ensure emails are being throttled:

sudo tail -f /var/log/mail.log

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