Contao > 4.3 sending emails with sendmail throw error on some providers

Older Versions of Contao (till 4.3) working like expected with sending emails via sendmail.
After upgrade to Contao 4.9 I got some errors at Providers like 1u1 / ionos or mittwald.

The error in the logs sound like:

"Expected response code 220 but got an empty response"

Sending Mails from CLI of the Server (means if logged in via SSH) working like expected:sendmail test" |

/usr/sbin/sendmail -t -v -f [email protected] [email protected]

Source: Symfony Questions

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