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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!
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