Guidance with handling email from emacs

[Bruno Victal]

Hi,

I'm attempting to move from Thunderbird to Emacs for handling my email
and would like some guidance with the task.
After reading the manual for Message Mode and the emacs-wiki I'm still
left with some lingering questions on how to replicate some of the
tasks and behaviors that I'm accustomed to with Thunderbird. Specifically,

* How to save drafts to an IMAP folder?
  I'm aware of `message-auto-save-directory' but this only saves
  messages to a local directory.

* Place a copy of the sent message in the IMAP Sent folder?
  I'm aware of the `mail-self-blind' variable that BCCs the mail to
  myself but I'm asking for this behavior in specific.

* Is there the equivalent of “Paste with quotation”?
  i.e. Paste contents of clipboard but with one level of quotation,
  regardless of where I copied the text from.

* How can I replicate the citation message style used in Thunderbird?
  i.e. “On 2023-09-18 07:57, _NAME_ wrote:”

* Is there a “right” way for easily handling multiple SMTP accounts (or
  identities as Thunderbird calls them)?
  The info from the emacs-wiki and the emacs manual seems a bit
  inconsistent or confusing in this matter.

* How can I omit the comment that is present in the `In-Reply-To'
  header? (as seen by BCC'ing the message to myself)
  --8<---------------cut here---------------start------------->8---
  In-Reply-To: <123456789@example.com>
        (name's message of "Thu, 1 Jan 1970 07:00:00 -0700")
  --8<---------------cut here---------------end--------------->8---

* ^Related to the above: Can I paste something and have it automatically
  enclose with the “…cut here…” lines instead of having to mark the
  region and do `C-c M-m'?

* Is it OK to manually put a `In-Reply-To' header in the message headers
  or will this get overwritten by emacs when sending with `C-c C-c'?

* Can I override the host-name that is sent in the headers? I see:
  --8<---------------cut here---------------start------------->8---
  Received: from my-host-name (unknown [192.0.2.1])
          (Authenticated sender: foo@example.com)
          by mail.example.com (Postfix) with ESMTPSA id 0000000000;
          Thu, 1 Jan 1970 00:00:00 +0200 (CEST)
  --8<---------------cut here---------------end--------------->8---
  Where my-host-name is the contents from /etc/hostname.


On receiving email, which emacs client would best mirror Thunderbird's
workflow? Or putting it in another way, what client fits best with an
IMAP oriented flow and allows displaying & organizing mail in IMAP
directories and can properly thread the discussions?


-- 
Thanks,
Bruno.