Using PHP configured sendmail paths, if [MAIL][transport] = sendmail is active
TYPO3 is using 'transport_sendmail_command' => '/usr/sbin/sendmail -bs' per default in /typo3/sysext/core/Configuration/DefaultConfiguration.php
"The command to call to send a mail locally. The default works on most modern UNIX based mail server (sendmail, postfix, exim)"
But this is not 100% correct, not every modern sendmail (e.g. msmtp) implementation is supporting the "-bs" option.
Sometimes for example "-t" is needed. OK, you can set it manually. But:
I think most of the hoster out in the web know their environment.
So why not trusting the hoster and using the PHP "sendmail_path" in "transport_sendmail_command" as default?