- By default, do not require SMTPD connection to be encrypted; introduce a new ENV variable to allow configuring the SMTPD security level
- Introduce the "probe" script for K8s probes
- When milters are not available, accept the e-mail by default
- Enable recipient_delimiter (address extension)
- Resolve various security vulnerabilities
- Fixing various CVEs in OpenSSL 3.0.7 and 1.1.1s
- Resolves security vulnerabilities CVE-2022-2097, CVE-2022-30065, CVE-2022-37434
- It is now possible to add multiple SMTPD milters through environment variable `POSTFIX_SMTPD_MILTERS`: the variable changed from singular to plural and now it can hold space separated list of milter endpoints