Use the retry-interval and max-delivery-rate in combination.
v=spf1 ip4:YOUR.SERVER.IP include:_spf.google.com -all
service pmta start # Start the service chkconfig pmta on # Enable auto-start (CentOS) systemctl enable pmta # Enable auto-start (systemd) systemctl start pmta
: Defines the default hostname for SMTP connections. powermta configuration guide top
Rate limiting is a feature that helps prevent abuse and overload on your email server. PowerMTA provides a rate limiting system that allows you to limit the number of emails sent within a specified time frame.
: Set this to your primary sending domain (e.g., mail.yourdomain.com ).
PowerMTA (PMTA) remains the gold standard for enterprise-grade email delivery, built specifically to handle millions of messages per hour with granular precision. However, out-of-the-box settings are not optimized for modern mailbox providers like Gmail and Yahoo, who aggressively throttle or block misconfigured servers. Use the retry-interval and max-delivery-rate in combination
: Limits the maximum number of concurrent SMTP connections to a domain.
<domain *> skip-mx yes </domain>
ISPs will rate-limit or block your IPs if you open too many connections or send too many emails per hour. You must configure custom rules for each major provider. PowerMTA provides a rate limiting system that allows
When a recipient clicks "Spam," the ISP sends a notification. Route these to a dedicated inbox for processing.
Before diving into the configuration guide, let's cover some basics:
Example:
virtual-mta vmta_marketing_01 virtual-mta vmta_marketing_02 Use code with caution. 2. Implementing Top-Tier Authentication Protocols