On 2023-07-31 at 02:43:28 UTC-0400 (Mon, 31 Jul 2023 08:43:28 +0200)
Fourhundred Thecat via Postfix-users <400the...@gmx.ch>
is rumored to have said:

Hello,

I am using Maildir format on my server (Postfix + Dovecot).

The individual filenames have this format:

    1690633510.M94611123819.mail,S=11706,W=12202:2,S

That message was delivered at Sat Jul 29 12:25:10 2023 UTC. It is 11706 bytes on disk and the "RFC822Size" (a.k.a. "wire size") is 12202 bytes, implying that it has 496 lines of text. It has been marked as seen by an IMAP client, and has no other IMAP flags set. The delivery agent believes that its hostname is simply "mail".


Now, I have another, unrelated email account (not my mail server), and I
have set up Thunderbird with local Maildir support.

Which is not compliant with any Maildir spec that I am aware of.

When I look inside
the folder, the emails have this nice and clear format:

for received:

  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx...@sender.com.eml

for sent:

  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx...@recipient.com.eml

how could I have such nice filenames on my server, with useful
information in the filename, instead of those ugly containing special
characters like '=' and ':' ?

You cannot. The names on the server are structured as defined in the Maildir spec and specifically constructed by the delivery agents (Postfix and/or Dovecot.) They include extended semantics specific to Dovecot that embeds metadata in the names.


Do the nioe filenames come from Thunderbird, or from the mailserver ?

TBird.

--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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