[MlMt] Excessive Message Duplication

Benny Kjær Nielsen mailinglist at freron.com
Fri Oct 2 17:01:16 EDT 2020

On 2 Oct 2020, at 21:56, Daniel Berdine wrote:

> 1: My primary email account (this one, at gmail) is almost continuously “throttled”. I can’t understand why. I’ve looked through all the documentation I can find and all the threads on the mailing list that seemed relevant. Eventually I decided that maybe it was repeatedly downloading lots of messages (though this was more because it seemed to be the case for others than because I could see the traffic). I had already intended to create new emails for different purposes to reduce the single email burden, so I decided now was as good a time as ever… So, I moved a bunch of emails and changed various subscriptions. For a while this seemed to help, but eventually I noticed some other issues (below).

We should focus on the “throttled” state first. MailMate won't work well as long as this happens since only the Inbox is really synchronized. Throttling most often happens for large accounts. I recommend that you change the synchronization schedule of most of the mailboxes in the account to “Manually” (Mailbox ▸ Synchronization Schedule). The exception should be mailboxes you often use in other email clients and/or devices. These mailboxes will still be synchronized when you select them or, e.g., move messages into them.

You can expand all mailboxes in the account by holding down ⌥ when you click the triangle (if you have a large hierarchy of mailboxes). You can use the shift key (⇧) to select a large range of mailboxes.

At first, you might even want to take most of your mailboxes offline using “Mailbox ▸ Take Offline”. When the account is no longer throttled then you can take more and more mailboxes online.

If this doesn't work then it might be because there is some kind of busy-loop issue with a specific mailbox. In that case, see if you can isolate the problematic mailbox (by taking everything else offline). Then we can generate logs to learn more about this mailbox.

When this works we can move on to your other points.

> 3: Some accounts have generated MASSIVE duplication of some messages. I’ve seen this on both gmail and outlook accounts. The worst is an outlook account that duplicated several messages at least 50,000 times [...]

Here we'll focus on the Outlook account. I'm assuming the emails show up in a specific mailbox? My guess is that MailMate is trying to upload a message. This “succeeds” without MailMate being aware of it and therefore it retries repeatedly. This can happen if the server breaks the connection for some reason immediately after each upload. That's just a guess.

See if you can reduce the problem to a specific mailbox and/or message. It might help, again, to take most of the mailboxes offline. You can keep the Activity Viewer (⌥⌘0) open. It might not make much sense to you, but you can see what is currently active.


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