On Sun, Jun 23, 2024 at 06:06:40PM +0000, Дилян Палаузов wrote:

> «sendmail -v myself@domain» however hangs.

Of course it does, it is waiting to read the message headers and body
from standard input as expected.

> until I press Ctrl+C.  This is Postfix 3.4.13.  On Postfix 2.11 the
> same command works. As far I see, there is no close(0), so read(0, …
> expect data from standard input.
> 
> Can you tell me why does «sendmail -v address» hang?

Because you haven't provided a message to send, and standard input is
attached to a terminal.  If you do not want to send a message:

    $ sender=la...@example.com
    $ recipients=(cu...@example.com m...@example.com)
    $ sendmail -f "$sender" -bv "${recipients[@]}"

-- 
    Viktor.
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