Added gosec to the list of enabled linters in `.golangci.toml`. Defined specific exclusion rules to ignore certain false positives and context-specific issues flagged by gosec, ensuring the linter does not impose on intentional code practices.
The Go version has been updated to 1.22 in the .golangci.toml file for compatibility reasons. Additionally, unnecessary white space has been removed from the smtp/smtp_test.go file to maximize code efficiency and readability.