[MlMt] Where is message flag color information kept?

[list.mailmate at munkynet.org]

Not an answer to your question, but I've usually found it more reliable 
to migrate email over IMAP (using, for example, MailMate) rather than by 
copying the underlying files. Especially when changing server software. 
Good luck!
-sam

*From: *Greg Earle <earle at isolar.DynDNS.ORG>
*To: *mailmate at lists.freron.com
*Date: *Jul 15, 2021 8:25:50 AM
*Subject: *[MlMt] Where is message flag color information kept?

> Benny et al.,
>
> I'm trying to migrate my mail server at work and have come across 
> something I don't understand.
>
> If I mark messages in my work e-mail account (in MailMate) with 
> red/yellow/green etc., MailMate running on my home Mac and my work Mac 
> correctly see the colors.
>
> Also, if I run Apple Mail on either my home Mac or my work Mac, they 
> also correctly see the colors on both systems.  This made me think at 
> first that the flag color information must be in the filename if not 
> metadata in the message file itself.
>
> But if I rsync my Maildirs from my old Ops mail server (Courier) to my 
> new Dev mail server (Postfix+Dovecot), both MailMate and Apple Mail see 
> every flagged message on the new server as being red - all the 
> yellow/green/etc. color differential/subtlety is getting lost 
> somewhere.
>
> I verified that the mail message files have the same exact filename, 
> size and checksum on both servers - so clearly the flag color can't be 
> kept in the file or the filename?
>
> I don't get it - how do Apple Mail and MailMate know about each other's 
> colors (yes I know MailMate implements Apple Mail's flag setup), but if 
> you copy the message to a different server and it's correctly 
> preserved, the color information is lost?
>
> tl;dr: Where do MailMate/Apple Mail store the flag color info for each 
> message?
>
> TIA,
>
>     - Greg
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