By the numbers:
1. This is the PostFix mailing list, not a mail client list.
2. Google is probably using their own home-grown MTA, based on what
I've seen in the headers and body. That's GOOGLE, baby!
3. Thunderbird sends out the delivery status return receipt request. I
must
Subject: [Thunderbird email client] Composing email: Clicking Options
> Delivery Status Notification Does Not Work At All!!!
Good day from Singapore,
Today is 13 November 2023 Monday Singapore Time 7 PM.
Recently I have installed Thunderbird email client version 115.4.1
(64-bit) SUPERNOVA in
