Add SMTP authentication auto-discovery #108

Job	Run time
Dependency review	14s
Test with Codecov coverage (ubuntu-latest / 1.23)	46s
Go vulnerabilities check	18s
REUSE Compliance Check	21s
Test (macos-latest / 1.19)	23s
Test with SonarQube review (ubuntu-latest / 1.23)	44s
Test (macos-latest / 1.20)	26s
Test (macos-latest / 1.21)	18s
Test (macos-latest / 1.22)	33s
golangci-lint (1.23)	28s
Test (macos-latest / 1.23)	35s
Test (ubuntu-latest / 1.19)	34s
Test (ubuntu-latest / 1.20)	27s
Test (ubuntu-latest / 1.21)	21s
Test (ubuntu-latest / 1.22)	27s
Test (ubuntu-latest / 1.23)	24s
Test (windows-latest / 1.19)	20s
Test (windows-latest / 1.20)	20s
Test (windows-latest / 1.21)	20s
Test (windows-latest / 1.22)	19s
Test (windows-latest / 1.23)	19s
Test on FreeBSD 13.4'	2m 10s
Test on FreeBSD 14.0	2m 11s
Test on FreeBSD 14.1	2m 13s
	15m 31s

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