Changed the URLs for RFC 4954 and RFC 4616 from plain text to HTML formats for improved readability and consistency. This adjustment does not affect the functionality but enhances the documentation quality.
Updated the comment for SMTPAuthType to more clearly explain its purpose as a type wrapper for SMTP authentication mechanisms. This improves code readability and helps future developers understand the type's function.
Extended documentation for each SMTP AUTH type including security considerations, relevant specifications, and the context for usage. Updated error descriptions for consistency and clarity. This enhances readability and provides better guidance for developers.
Enhanced the documentation by adding detailed comments for each SMTP authentication type, specifying their references to RFC documents. Corrected comments for error variables to match the corresponding authentication schemas.
Introduced the SMTPAuthNoAuth mechanism in the auth.go file meant for instances where authentication is not required or supported. Adjusted tests in client_test.go to account for this new mechanism. Minor order modifications were also made to the list of supported SMTP AUTH types and respective tests for better consistency.
Closes#176
# SUMMARY
* Bad licenses:
* Deprecated licenses:
* Licenses without file extension:
* Missing licenses:
* Unused licenses:
* Used licenses: CC0-1.0, MIT
* Read errors: 0
* Files with copyright information: 45 / 45
* Files with license information: 45 / 45
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