PowerMTA v5.0r7 Released – Changelog v5.0r4 to v5.0r7

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;

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