On 29/07/25 10:40 pm, Aditya Garg wrote:

Autoconfiguring SMTP server settings is a common feature present in many
email clients. In order to get the correct SMTP server settings easily,
this commit adds a `--get-smtp-server` option to `git send-email`. This
option attempts to fetch the SMTP server settings for a given email address
via the following steps:

1. It first tries to fetch the settings from Mozilla's ISPDB at
   `https://autoconfig.thunderbird.net/v1.1/[domain]`.

2. If that fails, it attempts to fetch the autoconfig file from the email
   provider's autoconfig URL, which is typically in the format
   `https://autoconfig.[domain]/mail/config-v1.1.xml?emailaddress=[email]`.

3. If that also fails, it falls back to checking the MX records of the
   domain used in the email address to find the SMTP server. It can be
   useful in case of emails with custom domains. It attempts to guess
   the correct domain for the email from the MX records, and repeats the
   first 2 steps with the guessed domain.

This feature is heavily inpired by the autoconfig feature in Mozilla
Thunderbird. A detailed documentation about how thunderbird fetches the
autoconfig settings can be found at:

https://www.bucksch.org/1/projects/thunderbird/autoconfiguration/

It has a v2, which I didn't send as a reply to this by mistake:

https://lore.kernel.org/git/20250730151227.12389-1-gargaditya08@live.com/T/#u (local)