upgrade postfix package from v3.7.3-r1 to v3.7.4-r0 (see below)
https://web.archive.org/web/20230128075803/https://www.postfix.org/announcements/postfix-3.7.4.html
https://web.archive.org/web/20230128075530/https://git.alpinelinux.org/aports/commit/main/postfix?h=3.17-stable&id=137798230ca4204283aa92bf650826eb22c72b3f