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
The Go version has been updated to '1.22' in the 'sonarqube.yml', 'golangci-lint.yml', and 'codecov.yml' GitHub action workflow files. This includes an additional modification for the Go versions matrix and condition statements in the 'codecov.yml' workflow.
Introduced "multipart/mixed" and "multipart/related" content types in encoding.go and updated msgwriter.go to accommodate these. Adjustments made in related tests for these new types. Additionally, removed unnecessary print statements and improved multipart alternative parsing in eml.go.
Refactored the processing of multipart encoding to be robust and easily maintainable. The changes include setting 'QP' encoding as default when the Content-Transfer-Encoding header is empty, accounting for the removal of this header by the standard Go multipart package. Also, parser functions for content type and charset are now independently handling the headers, replacing the split-string approach, thus improving efficiency and code readability.
Extended the settings for content type and charset from headers. Also, refactored the handling of encoding types - 'QP' and 'B64' - within the mail header and body parsing sections. The process of handling encoding for plain type mail specifically is now encapsulated in a new function, parseEMLBodyPlain. These changes enhance code readability, maintainability, and error handling efficiency.
The variable names "mbbuf", "mt", and "par" have been renamed to "bodybuf", "mediatype", and "params" respectively, for clarification. Moreover, the multipart parsing block within the parseEMLBodyParts function was extracted into its own function, parseEMLMultipartAlternative, for improved code structure and readability.
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.
A new "X-Auto-Response-Suppress" header has been added. The SetBulk method has been updated to include this new header, as it is recommended for automated emails. This functionality is tested in the msg_test.go file.
The code has been updated to allow for an HTML alternative to the plain text body in messages. This includes adding a new function to add this alternative body along with additional unit tests to ensure the multipart messages are properly constructed. The tests also check the correct usage of different charsets.
New unit tests have been introduced for WithPartCharset and SetCharset methods in part_test.go. Also, a GetCharset method has been implemented in part.go. These modifications ensure the robustness of charset handling within the application.
Charset support has been added in the 'Part' struct. A 'SetCharset' method and a 'WithPartCharset' option have been added to override the default Part charset. The 'writePart' function in msgWriter now accommodates the charset defined at the Part level, defaulting to the previous functionality if not set.
Test cases have been added for numerous client functionalities including WithTLSPortPolicy option for the NewClient method, Client.SetSSLPort method, and the Client.DialWithContext method with the fallback port functionality. Minor code simplification has also been performed in the 'SetSSLPort' function in client.go file.
Enhanced the unit tests in client_test.go by adding more test cases for SSL Port and TLS Port Policy. These additions contribute to more effective coverage of edge cases and increase the robustness of the test suite.
The codecov-action version used in the GitHub workflow file has been upgraded from v2 to v3. This enhances the reliability and performance by leveraging the new features and improvements available in version 3. This commit doesn't affect the functionality of the project but is more of a dependency update.
Introduced default ports for SSL/TLS and STARTTLS connections in SMTP client. Also added fallback behavior, allowing the client to attempt connections on port 25 using plaintext if secured connections fail. Deprecated old methods and implemented new ones to enforce these changes effectively.
This is a copy of the PR muhlemmer:enhance-default-tls-port by @muhlemmer. Since they unfortunately didn't reply in the PR anymore I cloned the PR. They will be fully attributed in the PR, though.
The FreeBSD version used for testing in .cirrus.yml has been updated from 12.4 to 14.0. This change ensures that the tests run on the latest stable version of the operating system, providing more reliable and up-to-date test results.
This commit adds checks in the testing functions to verify the successful implementation of message delivery status. A new attribute `isDelivered` is now being validated in our tests, reinforcing the message tracking system and enhancing the overall reliability of our application.
This update introduces a new property, `isDelivered`, in the message struct to track if a message has been successfully sent or not. Additionally, this also includes a new helper function `IsDelivered` to easily retrieve the status. This feature enhances the tracking capabilities of outgoing messages across different client files.
This commit introduces the ability to handle multipart messages within the eml.go file. It reads individual parts of multipart messages, sets the encoding and content for each part, and implements error handling for potential issues like a missing boundary tag or difficulties acquiring the next part of a multipart message.
The list of common content types in encoding.go has been revised. The type "multipart/alternative" has been added and the order of types has been adjusted for consistency with net/smtp upstream.
Implemented a null check to ensure the 'fi' file handle is not empty. With the absence of this check, the test was continuing even when 'fi' was empty, leading to null pointer exceptions further down in the code.
Added robustness and improved error handling in msg_test.go by adding null checks before calling values from the genHeader map in RequestMDNTo and related functions. This enhancement was necessary to avoid the operations on non-existing keys and potential null pointer exceptions.
Added additional checks when calling values from the genHeader map in msg.go file. This is to prevent trying to operate on non-existing keys, hence avoiding possible null pointer exceptions. The checks ensure the key HeaderMessageID exists in the genHeader map before attempting to operate on it. This is essential for functions like RequestMDNTo, RequestMDNToFormat, and RequestMDNAddToFormat, thereby improving the robustness of the code.