g.d.o emailed subject header prefixes are inconsistent, thereby making it impossible for mailreader to filter them correctly

Posting this on behalf of mbr, who apparently had validation issues.

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Problem/Motivation

The Subject headers of some of the emails sent from groups.drupal.org make it impossible for my mailreader to filter them in a useful manner.

On some emails, the subject line prefix represents the name of the group the article was posted to, but on others it does not. For those where the prefix isn't the name of the group, I don't understand where the prefix is coming from.

Proposed resolution

Unknown.

Remaining tasks

Diagnose problem. If it's a real bug, fix it. If it's behaving as intended, explain the rationale.

User interface changes

Unknown.

API changes

Unknown.

Original report by MBR

In most forums or mailing lists, there's a convention that the Subject header begins with a prefix identifying the group where the mail originated. Usually the group identifier is delimited either by square brackets (e.g. "[Name of Group]") or a colon (e.g. "Name of Group: ").

On groups.drupal.org, I'm a member of three groups: Boston, New Hampshire, and VoIP Drupal. So I have filters set up in my mailreader for subject headers that begin with: "Drupal Groups Boston", "Drupal Groups New Hampshire", and "Drupal Groups VoIP Drupal". Some emails to these groups come in with these prefixes and my mailreader filters them into appropriate folders. But other emails to these groups have quite different prefixes so my mailreader doesn't recognize them as coming from these groups.

For example, I received an email from noreply@groups.drupal.org with the subject line "Drupal Groups Drupal Churches Home: New Site - St. Matthew's UMC and The Rockingham Church." I'm not a member of a Drupal Church group, so I couldn't figure out why I received this email until I clicked on the "Read more at" link in the email which took me to http://groups.drupal.org/node/59733#comment-755558. There I discovered that the article was posted to the New Hampshire group. Since I'm a member of the New Hampshire group, it makes sense that I'd receive that email. But other emails from groups.drupal.org for that group have a subject line prefix "Drupal Groups New Hampshire: ". So I don't understand why the subject line prefix on this email is "Drupal Groups Drupal Churches Home: ".

Similarly, I've recently been receiving emails with the subject line "Drupal Groups Twin Cities: Is anyone using Drupal to connect their neighbors? (Twin Cities)". I live near Boston, Mass. which is nowhere near Minneapolist-St. Paul, Minn. I couldn't understand why I'm receiving email for a Minnesota group until I clicked on the "Read more at" link which took me to http://groups.drupal.org/node/251383#comment-811073. There I found that the article was posted to the VoIP Drupal group of which I am a member. So why is the subject line prefix on this email "Drupal Groups Twin Cities: "?

These are not the only examples.

Email posted to the groups.drupal.org New Hampshire group has arrived with the subject line prefix: "Drupal Groups New York City".

Email posted to the groups.drupal.org VoIP Drupal group has arrived with the subject line prefix: "Drupal Groups Portland (Oregon)"

So they don't match my mailreader filters, and therefore don't get moved to the right folders. And I end up seeing mail in my inbox that claims to be from a group on the other side of the continent that I know I'm not subscribed to, and wondering why I'm receiving it.

Anyone know what's going on here?