PowerMTA now supports the ability to auto-increase cold VirtualMTA mail volumes with a list of daily limits. One can also specify the maximum number of connections to be opened for this domain during the specified time period per IP per domain/vmta. This is primarily used by sites that define multiple IPs in a single VirtualMTA, and that want to limit the attempted delivery rate for each IP address in the VirtualMTA to the respective domains. IP rate limiting allows for controlling the number of attempted recipients on a per-hour, per-minute and per-second basis for each IP address for each domain/VirtualMTA. To help optimize DNS usage during peak sending times, PowerMTA now offers the ability to precache predefined domain names to ensure the DNS name is always available. This may be very useful for instances when it takes a long time to build a campaign, or if you need to adhere to strict delivery windows. PowerMTA now supports the ability to schedule deliveries via a header. This new version has several significant features as mentioned by Port25 : We have been expecting this release since a year and now it is out of beta with a stable release. Port25 has just announced the new major release of PowerMTA : v4.5.
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