Dear Bill, thanks for the input. Your maximum of 26 might be the
explanation. In fact, beside my 26 Mailmate tags, I see in Preside a
bunch of additional tags/keywords that start with $ ($Junk,
$MDNSent,…), which I guess are “universal” keywords. The question
is : how are these 26 selected (not the most recent, not the oldest, not
the first or last by alphabetical order), and am I allowed to decide
which 26 are accessible (I guess not).
In addition, as my server uses Exchange, I am even more surprised that
it works, even if only partially.
Alain
On 8 Jun 2024, at 17:45, Bill Cole wrote:
On 2024-06-08 at 07:14:09 UTC-0400 (Sat, 8 Jun 2024 13:14:09 +0200)
aisrael <[email protected]>
is rumored to have said:
Following these email exchanges with Scott and Benny, I finally went
to the advanced Search settings of Preside, and much to my surprise,
I was able to access 25 of my Mailmate tags (why 25 among the ~100 I
use, this is beyond my limited understanding). This is supposed to be
impossible, but it seems to work??????
It is almost entirely a server-side issue, as Benny said. However, MM
has a slightly quirky feature of using its own private "tag" names
that it maps to arbitrary IMAP keywords as defined in the Tags prefs
pane so other MUAs do not actually see the MM tag, they see the IMAP
keyword. Any MUA should be able to see any keyword set by MM, IF the
server supports user-defined keywords.
Beyond that, you may be running into a server-side limitation. I do
not know if it remains true, but historically Dovecot (the most common
open source IMAP server) supported a maximum of 26 user-defined
keywords across any one mail folder when using Maildir storage (the
most common choice.) The technical basis of that limit (using a-z as
indices in filenames) remains, but I don't know if they have worked
around it in the past decade. Other IMAP servers using Maildir storage
may have similar trouble. If your 25 is actually 26, I would guess
that this is the root of your trouble.
GMail has much stranger issues, as they conflate folders and keywords.
MS365 and Exchange avoid the problem by not supporting user-defined
keywords. I would guess that there are specific quirks in iCloud and
Yahoo mail as well, but I'm not familiar with them.
Alain
Dear Scott and Benny, thank you for the answers that confirm my
worries. I do use Mailmate tags extensively, I currently use about a
hundred of them, including 4-5 of the classical custom IMAP keywords.
The only other mail client I use is Preside on my iPhone, which is
very good but, as you explain for the other clients, cannot
“read” the tags. I also checked Thunderbird recently, but it
still does not work.
Too bad for me.
Alain
On 8 Jun 2024, at 9:27, Benny Kjær Nielsen wrote:
On 7 Jun 2024, at 18:06, aisrael wrote:
My understanding, as a non expert in mail clients’ subtleties, is
that it is impossible to transfer tags (or smart mailboxes based on
tags) from Mailmate to another client (except for a few IMAP
keywords). Is it absolutely impossible, or is there a workaround?
Scott already gave a thorough answer. I'll just add some random
thoughts:
* Not all servers support IMAP keywords, in particular,
Office365/Exchange. In those cases, MailMate will quietly (which is
kind of bad) make them local-only.
* Some server have a limit on the number of IMAP keywords which
results in various silent errors (like tags getting cleared shortly
after being set).
* Thunderbird has, I think, 5 custom IMAP keywords. Tags can be
created in MailMate which map to those keywords and then they should
work nicely together.
* Colored flags in Apple Mail also uses IMAP keywords. MailMate
mirrors this behavior.
--
Benny
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