Merge pull request #421 from wneessen/bug/smime-fix-header-count #196

Job	Run time
Test with Codecov coverage (ubuntu-latest / 1.23)	53s
Dependency review	11s
golangci-lint (1.23)	29s
Go vulnerabilities check	18s
REUSE Compliance Check	14s
Test with SonarQube review (ubuntu-latest / 1.23)	1m 34s
Test (macos-latest / 1.19)	1m 5s
Test (macos-latest / 1.20)	50s
Test (macos-latest / 1.22)	23s
Test (macos-latest / 1.23)	24s
Test (ubuntu-latest / 1.19)	33s
Test (macos-latest / 1.21)	24s
Test (ubuntu-latest / 1.20)	28s
Test (ubuntu-latest / 1.22)	25s
Test (ubuntu-latest / 1.23)	22s
Test (ubuntu-latest / 1.21)	26s
Test (windows-latest / 1.19)	1m 15s
Test (windows-latest / 1.20)	2m 10s
Test (windows-latest / 1.21)	2m 21s
Test (windows-latest / 1.22)	2m 39s
Test (windows-latest / 1.23)	1m 40s
Test on FreeBSD 13.4'	2m 21s
Test on FreeBSD 14.0	2m 27s
Test on FreeBSD 14.1	2m 22s
	26m 14s

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