minor fix for func ResetWithSMTPClient and DialAndSendWithContext #303

Job	Run time
Test (ubuntu-latest / 1.25)	48s
Test (macos-latest / 1.24)	43s
Test (windows-latest / 1.25)	5m 38s
Test (windows-latest / 1.24)	3m 40s
Test (macos-latest / 1.25)	32s
Test (ubuntu-latest / 1.24)	49s
REUSE Compliance Check	18s
Test with Codecov coverage (ubuntu-latest / 1.25)	3m 11s
golangci-lint (1.25)	40s
Go vulnerabilities check	42s
Dependency review	13s
Test on FreeBSD 13.5	5m 27s
Test on FreeBSD 14.2	4m 29s
Test on FreeBSD 14.3	3m 2s
	30m 12s

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