[GNC] Duplicate emails in GnuCash Digests

[Fred Bone]

On 05 February 2020 at 7:32, Alan A Holmes said:

> >From a user perspective I see duplicate messages from "D via
> >gnucash-user" for most, but not ALL, of D's posts. I don't recall
> >duplicates from anyone else, but if there have been any it's only been
> >the odd one or two, and not enough to stick in my memory.
> 
> I notice D's messages as I retrieve each message in my mail client,
> Outlook, and they come in next to each other.
> 
> I've compared the properties of 2 such messages and there's very little
> difference between them. Mostly the differences are the processing done by
> my ISP, times and id's etc., which you would expect for 2 separate
> messages. There's also a difference in the processing done at gnucash.org
> for messages received from yahoo.com, D's ISP, id's etc., which may
> indicate gnucash.org is receiving 2 messages.

FWIW:

1. You can tell a duplicated message from one that's been sent twice by 
looking at the Message-ID: header, which is (required to be) unique to 
each "origination" (normally set by the sending mailer, sometimes by the 
first mail server that sees the message). The ones I've checked recently 
are being duplicated somewhere as both copies have the same Message-ID.

2. You can usually tell where the duplication has happened by comparing 
the Received: headers, which are found in reverse date-time order. The 
earliest will be the same. As I get the Digest, which strips these, I 
can't offer anything useful.

3. Other mailing-lists I'm on have been reporting duplication issues with 
messages passing through Yahoo (and BTInternet, which is managed by 
Yahoo), with duplicates sometimes appearing after several weeks.