Migration to PGLister

Greetings!

This list has now been migrated to new mailing list software known as
'PGLister'. This migration will impact all users of this mailing list
in one way or another.

If you would like to unsubscribe from this mailing list, please click on
'Show Original' or 'Show Headers' in your client and find the
'List-Unsubscribe' header which will include a link that you can click
on (or copy/paste into your browser) and use to unsubscribe yourself
from this list.

The changes which we expect to be most significant to users can be found
on the wiki here: https://wiki.postgresql.org/wiki/PGLister_Announce the
current version of which is also included below.

Note that the pgsql-hackers email list is used in examples below, but
this change applies to all project mailing lists.

Managing subscriptions and unsubscribing
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* PGLister includes a web interface which is greatly improved from
the old majordomo2 system. Users can log into the PGLister system
using their regular community account [2].

* The URL for users to manage their subscriptions in PGLister [3] is:
https://lists.postgresql.org/manage

* At this page, users can subscribe, unsubscribe, and adjust
parameters associated with their mailing list subscriptions.

* There is also an option at the above URL to have a test email
sent from the mailing list system as if it were being sent from the
list, to assist users with testing their filter settings.

* List members who do not have a community account [2] may
create an account and then, through the PGLister web interface,
associate their email address(es) with their account.

No adjustment of Subject: lines any longer
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* The "Subject:" header will no longer be changed to include the name
of the list (for example, "[HACKERS]"). This change is to avoid
breaking DKIM [1] (a standard for preventing nefarious changes in
email between the sender and the receiver by calculating a hash of
certain headers and the body). Not breaking DKIM signed messages will
make it less likely that emails sent through our mailing lists will be
classified as spam.

* If you filter your email based on those "Subject:" header insertions,
you will need to adjust your filtering rules. We recommend looking at
the industry standard "List-ID:" header instead.

New email addresses for the lists
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* Existing email addresses will continue to work for a while

* For example, this means that pgsql-hackers(at)postgresql(dot)org will change
to be pgsql-hackers@'''lists'''.postgresql.org.

* Having a flat namespace that both lists and user accounts, as well as
other addresses, live in has been a maintenance issue for the
PostgreSQL Infrastructure team. It also prevents us from implementing
DKIM [1] on messages from postgresql.org. Moving the lists to
"lists.postgresql.org" reduces this burden, allows us to implement
DKIM [1], and allows additional flexibility for handling other lists
in the future.

* The existing list email addresses will work for some time, but
eventually must be retired for us to realize the maintenance burden
reduction.

Other email header changes
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* The old majordomo2 system used both non-standard and industry standard
headers to provide information about which list a given message came
from.

* PGLister will use standard, industry-recognized headers to identify
mailing list messages. The non-standard header "X-Mailing-List" will
no longer be included. Any users whose filters are based on this
non-standard header will need to adjust their filters.

* The value of the headers will also be changing, to match the change
of list names. The header "List-ID" will be changed from, eg,
"List-ID: <pgsql-hackers.postgresql.org>" to
"List-ID: <pgsql-hackers.lists.postgresql.org>". Users who have
filters defined to use this header will need to adjust their filters
to account for this change.

* Certain email providers should be able to take advantage of these
headers automatically to provide things such as an "Unsubscribe"
button, but we cannot guarantee this as it depends on their systems.

Email footer removal
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* The footer text inserted by the old majordomo2 system will no longer
be included in each email (the footer is the text which starts with:
"Sent via pgsql-hackers mailing list (pgsql-hackers(at)postgresql(dot)org)").
Removing the footer is necessary to avoid breaking DKIM [1] signed
messages as they pass through our system.

Cross-posts not de-duped
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* Emails cross-posted to multiple lists will no longer be de-duped, so
if posted to two lists the message will be delivered twice. Both
copies will have the same message-id (and can be locally de-duplicated
on that), but different envelope sender and recipient addresses.

Digest capability offered by majordomo2 no longer supported
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* This was discussed with a few of the users who use digest and
determined to be acceptable.

* Using digest emails also caused problems when a user replies to
the digest email.

* There are no plans to implement digest capabilities in PGLister
in the future.

Thank you!

Stephen (on behalf of the pginfra team)

[1]: DKIM - https://en.wikipedia.org/wiki/DomainKeys_Identified_Mail
[2]: Community Account - https://www.postgresql.org/account
[3]: Manage subscriptions - https://lists.postgresql.org/manage