fix: Adjust the email sending validation logic and optimize error messages

[WangYuhang-CN]

Related Issues or Context

#2460

This PR contains Changes to Non-Plugin

• Documentation
• Other

This PR contains Changes to Non-LLM Models Plugin

• I have Run Comprehensive Tests Relevant to My Changes

This PR contains Changes to LLM Models Plugin

• My Changes Affect Message Flow Handling (System Messages and User→Assistant Turn-Taking)

• My Changes Affect Tool Interaction Flow (Multi-Round Usage and Output Handling, for both Agent App and Agent Node)

• My Changes Affect Multimodal Input Handling (Images, PDFs, Audio, Video, etc.)

• My Changes Affect Multimodal Output Generation (Images, Audio, Video, etc.)

• My Changes Affect Structured Output Format (JSON, XML, etc.)

• My Changes Affect Token Consumption Metrics

• My Changes Affect Other LLM Functionalities (Reasoning Process, Grounding, Prompt Caching, etc.)

• Other Changes (Add New Models, Fix Model Parameters etc.)

Version Control (Any Changes to the Plugin Will Require Bumping the Version)

• I have Bumped Up the Version in Manifest.yaml (Top-Level Version Field, Not in Meta Section)

Dify Plugin SDK Version

• I have Ensured dify_plugin>=0.3.0,<0.6.0 is in requirements.txt (SDK docs)

Environment Verification (If Any Code Changes)

Local Deployment Environment

• Dify Version is: , I have Tested My Changes on Local Deployment Dify with a Clean Environment That Matches the Production Configuration.

SaaS Environment

• I have Tested My Changes on cloud.dify.ai with a Clean Environment That Matches the Production Configuration

[gemini-code-assist]

Summary of Changes

Hello @WangYuhang-CN, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the email sending functionality by implementing more precise validation for sender email addresses and improving the clarity of associated error messages. The changes ensure that email credentials are correctly formatted and provide users with actionable feedback when issues arise, ultimately enhancing the reliability and user experience of the email tool.

Highlights

• Enhanced Email Validation: The email sending logic now includes more robust validation for both sender_address and email_account credentials, ensuring proper email format before sending.
• Improved Error Messages: Error messages for invalid email addresses have been optimized to provide clearer guidance, distinguishing between sender_address and email_account issues and suggesting how to bypass validation.
• Plugin Version Update: The email tool plugin version has been incremented from 0.0.9 to 0.0.10 in manifest.yaml to reflect these changes.

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[gemini-code-assist]

Code Review

This pull request refactors the email validation logic for sending emails, which is a good improvement. It now correctly validates the sender_address if provided, falling back to the email_account otherwise. The error messages are also more descriptive. I've noticed a small inconsistency in the implementation between send_mail.py and send_mail_batch.py regarding a redundant check, and I've left a comment with a suggestion to align them.

[WangYuhang-CN]

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