PowerMTA aka PMTA is considered one of the best commercial MTA (Message Transfer Agent), currently being used by some of the known ESPs (Email Service Providers) & enterprise businesses such as MailChimp, Microsoft, IBM, etc.
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Continuing the good & hard work by team behind PowerMTA, new v5.0r7 has been released on 2021-01-07. Let’s see what is changed since v5.0r4 release:
2021-01-07: released build 5.0r7 - added support to configure click tracking and top/bottom open pixel insertions independently from each other when using engagement tracking with SparkPost Signals; - extended "smtp-pattern-list" to allow specifying the time interval after which a queue will return to normal mode after being set into backoff mode with the mode=backoff action; - extended "include" directive to support fetching configuration from external sources through HTTP or HTTPS; - added support for DKIM signing DSN emails issued by PowerMTA; - added "pmta show vmta-settings" command to view settings of a particular VirtualMTA; - added support for customizing key length of DH (Diffie-Hellman) parameters used during a TLS 1.1 or TLS 1.2 handshake; - added "max-memory-usage-percent" directive to configure the maximum memory consumption of the PowerMTA process beyond which it will stop accepting incoming email; - fixed a bug in cold VirtualMTA selection which reduced the amount of email rerouted to a cold virtual MTA when MX rollup patterns are also configured; - upgraded to OpenSSL 1.1.1i, to get the latest bug fixes; - other small improvements and fixes; 2020-10-27: released build 5.0r6 - added support for SMTP MTA Strict Transport Security (MTA-STS) mechanism, described in RFC 8461, for enforcing secure delivery of email over encrypted connections to remote domains that support it; - added support for persistent connections for inbound HTTP connections when using Transmissions API to submit messages to PowerMTA; - greatly improved speed of reload operation when configuration file has large number of domain keys and virtual MTAs defined; - disallowed TLSv1.1 by default for incoming SMTP and HTTP connections to PowerMTA since it is now considered deprecated; - added support for HAProxy protocol version 2 for outbound traffic from PowerMTA; - fixed bugs in webhooks delivery when using compressed delivery over HTTPS and reduced frequency of retries when webhook connection attempts fail; - added List-Unsubscribe-Post to the default list of headers that are included in DKIM signature; - upgraded to OpenSSL 1.1.1g, to get the latest bug fixes; - other small improvements and fixes; 2020-07-13: released build 5.0r5 - added support for volume based licensing option in PowerMTA; contact PowerMTA sales for more details about the new volume licensing option; - added support for writing accounting files in JSON format in addition to regular CSV format; - added support for webhooks to deliver accounting data in CSV or JSON format over HTTP(S) to a remote server; see User's Guide for more details on how to configure webhooks for accounting files; - added support for customizing with interpolation of select variables in "From" & "Subject" headers and content of the body of DSN reports issued by PowerMTA; - restructured the User's Guide to highlight the various SMTP & HTTP APIs available with PowerMTA, and specifically added more detailed documentation on HTTP APIs; - fixed crash caused when processing email addresses with malformed UTF-8 characters during inbound reception; - fixed source IP address for a connection incorrectly shown as "255.255.255.255" in some circumstances in "Errors" column on the web monitor's queue detail page; - fixed PMTA SNMP daemon failing to start in AgentX subagent mode; - we have added a retrospective entry to the 5.0r2 changelog reproduced here; fixed proxy connection information not being cleared before reusing a connection worker in another queue. Only affects PowerMTA 5.0r1 version when using proxy feature; we recommend upgrading to at least PowerMTA 5.0r2 version if you use proxy feature; 2020-04-16: released build 5.0r4 - added ability to reroute messages from a queue to a Virtual MTA pool; - added support for engagement tracking events (opens/clicks) when using Sparkpost Signals; - added support for recording time of first attempt for a recipient in delivery(d), bounce(b) and transient(t) accounting records; - added support for use of domain macros with "<address-list>.domain", "relay-domain" and "domain-key" directives; - pinned main configuration file to the top of the list of files shown on the configuration edit page in the web monitor; - other small improvements;
Let us know, how much you like PowerMTA in comments below!