[Users] Where do duplicate messages originate?

[Marco Moock]

Am 02.11.2024 um 14:23:12 Uhr schrieb Bob Williams:

> Where do duplicate messages come from? I get quite a few, all in
> mailing lists. Are they 'pushed' by the mailing list server or
> 'pulled' by the MUA?

Depending on the mailing list configuration there will be a Reply-To
header that may include the mailing list address and the original
poster address. A correct working MUA will now send to both addresses.
Some people remove the poster's address manually in that case.
If not, you receive both messages.

They have the same Message-ID and some mail servers (e.g. Cyrus) detect
that and will reject the messages that arrives second.

> Can they be prevented, somehow?

By changing the mailing list settings.

-- 
Gruß
Marco

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