Have you found a solution?
I have the exact same issue on Centos 8.
at first, I was having an error when updating ImageMagick packages because of the enabled version of Perl. while trying to enable a newer version of perl, i used --allowerasing , which uninstalled postfix-mysql and I Postfix stopped sending emails. I installed back postfix-mysql, bust since then i started having the same message as yours in the daily email:
warning: /var/tmp/rpm-tmp.PuSCgO: Header V4 DSA/SHA1 Signature, key ID 914bdf7e: NOKEY
error: Failed dependencies:
postfix = 2:3.5.8-4.el8 is needed by (installed) postfix-mysql-2:3.5.8-4.el8.x86_64
And the dnf list installed | grep postfix gives:
postfix.x86_64 2:3.5.8-4.el8 @baseos
postfix-mysql.x86_64 2:3.5.8-4.el8 @appstream
if you found a solution or if anyone could help please. Is there a custom version of postfix-mysql for CWP that should be used for example?