The removed check for a nil SMTP client was redundant because the previous error handling already covers this case. Streamlining this part of the code improves readability and reduces unnecessary checks.
This change removes an unnecessary blank line at the end of the TestClient_sendSingleMsg function in the client_test.go file. Keeping the code clean and properly formatted improves readability and maintainability.
Introduce a new test, `TestClient_DialToSMTPClientWithContext`, to verify client behavior when establishing and closing an SMTP connection with context handling. Also added a sub-test to simulate and confirm failure scenarios during SMTP connection establishment.
Renamed `SMTPClientFromDialWithContext` to `DialToSMTPClientWithContext` for clarity and consistency. Updated method parameters and documentation to standardize context usage across the codebase.
Updated several Client methods to accept a smtp.Client pointer, allowing for more flexible and explicit SMTP client management. Added detailed parameter descriptions and extended error handling documentation.
The new Send function in client.go adds thread safety by using a mutex. This change also removes duplicate Send functions from client_119.go and client_120.go, consolidating the logic in one place for easier maintenance.
Added a mutex lock and unlock around the Send function to prevent concurrent access issues and ensure thread safety. This change helps avoid race conditions when multiple goroutines attempt to send messages simultaneously.
Separated debug logging and logger setting methods to include SMTP client parameter for better encapsulation. Removed commented-out code for cleaner and more manageable codebase.
Refactor `DialWithContext` to delegate client creation to `SMTPClientFromDialWithContext`. Add new methods `SendWithSMTPClient`, `CloseWithSMTPClient`, and `ResetWithSMTPClient` to handle specific actions on `smtp.Client`. Simplify `auth`, `sendSingleMsg`, and `tls` methods by passing client as parameters.
Mutex locks are added to ensure thread safety when setting DSN mail return and recipient notify options. This prevents data races in concurrent environments, improving the client's robustness.
Updated tests to correctly assert the absence of an SMTP client on failure. Added concurrent sending tests for DialAndSendWithContext to improve test coverage and reliability. Also, refined the `AutoDiscover` and other client methods to ensure proper parameter use.
Updated the timeout for the DialAndSend context in 'client_test.go' from 5 seconds to 1 minute to ensure sufficient time for the operation to complete. This change helps prevent premature timeouts that can cause test failures.
Introduced a sendMutex to synchronize access to shared resources in the DialAndSendWithContext method. This ensures thread safety when sending multiple messages concurrently. Added a corresponding test to verify the concurrent sending functionality.
Updated the .golangci.toml config to exclude gosec rule G402 in quicksend_test.go. This exclusion is intentional as these tests do not require TLS settings.
Introduced a new io.Writer field `EchoBuffer` and its associated `BufferMutex` to `serverProps`. Updated relevant test code to write SMTP transaction data to `EchoBuffer` if it is set, ensuring thread safety with `BufferMutex`.
Introduce the QuickSend function for sending emails quickly with TLS and optional SMTP authentication. Added comprehensive unit tests to ensure QuickSend works correctly with different authentication mechanisms and handles various error scenarios.
Introduce new methods AttachFromIOFS and EmbedFromIOFS to handle attachments and embeds from a general file system (fs.FS). Updated tests to cover these new functionalities and modified error messages for consistency. Updated README to reflect support for fs.FS.
Updated functions to use the io/fs package instead of embed.FS, making the code more flexible with respect to different filesystem implementations. Revised the method signatures and related documentation to reflect this change.
Extended the `UnmarshalString` function in `auth.go` to recognize "auto", "autodiscover", and "autodiscovery" as `SMTPAuthAutoDiscover`. Corresponding test cases were also added to `auth_test.go` to ensure proper functionality.
Refactor the `preferList` definition in `client.go` for improved readability and consistency. This change ensures the code aligns with standard formatting practices.
Refactor the auth type initialization to prevent incorrect assignments and handle empty supported lists. Added comprehensive test cases to verify auto-discovery selection of the strongest authentication method and ensure robustness against empty or invalid input.
Implemented a mechanism to automatically discover and select the strongest supported SMTP authentication type. This feature simplifies the authentication process for users and enhances security by prioritizing stronger mechanisms based on server capabilities. Corresponding tests and documentation have been updated.
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.
