Duplicate Messages Across System

[Michael Lustfield]

This seems to be common among the entire system, but I first noticed this with a mailing list.

On a mailing list, if a user is a member of two different teams and one of those teams is signed up to the others mailing list, a user will get that exact same message twice. I imagine using teams to join teams -and- sign up for the mailing list is uncommon and probably not the smartest move... but... it is being done. It would be preferable if the user were only messaged once.

I see this same behavior with bugs. If a user is getting notifications from a team that is in charge of bugs and they change one of those bugs, they will get a message about their actions twice. Once is plenty for something you're doing your self. Happens for blueprints too.

[Barry Warsaw (barry)]

It should not be possible for a team to subscribe to a mailing list. Teams don't have active account status so even if that were possible, they should never be able to receive mailing list postings.

However, I don't quite understand the bug report. Are you saying that the duplicate message is a mailing list post from a person, or a message generated by Launchpad in response to some event?

[Curtis Hovey (sinzui)]

Given that we do not send email to teams, only people, it should not be possible for duplicate email to come from a Launchpad mailing list.

[Michael Lustfield (michaellustfield)]

I think this happens because a user will be a member of two teams and one team will be a member of the other.

Team_1
  |- User_1
  |- Team_2
    |- User_1

I initially created this bug report because I sent a message to the ubuntumembers team. Some users got the message up to 4 times.

[Curtis Hovey (sinzui)]

Are all the teams launchpad teams, and did you send the message to a team with a *launchpad hosted* list?

[Curtis Hovey (sinzui)]

/me notes that ubuntu does not use launchpad's hosted mailing-lists.

[Michael Lustfield (michaellustfield)]

I used https://edge.launchpad.net/~ubuntumembers/+contactuser

The other teams are launchpad teams. I believe the other teams do not have a mailing list either.

[Curtis Hovey (sinzui)]

Thanks for that information. This is a known issue. We decided was we need to honour the intent of the team. The team has setup a contact address, and we will not undermine them. There is also a lot of complexity in calculating what is the right origin for each person's email (because the headers and footers are different)

I recommend setting up a filter on the to remove duplicate message ids.