Add configurable email age threshold bypass for regex testing

[Copilot]

Task: Add configuration option to disable 15-minute email age threshold for testing purposes

Plan

• Add DisableEmailAgeThreshold boolean property to MailAgentOptions class
• Update MailService.cs to check the configuration option before filtering old emails
• Add warning in ConfigurationValidator when the threshold is disabled
• Update appsettings.json with the new configuration option
• Test the changes by building the project
• Run security checks (CodeQL)
• Verify logic and behavior
• Remove comment from appsettings.json
• Extend documentation in readme.md

Summary

Successfully implemented the DisableEmailAgeThreshold configuration option to allow testing regular expressions against older emails.

Latest Changes (commit: addressing review feedback):

• ✅ Removed inline comment from appsettings.json
• ✅ Added comprehensive documentation in readme.md under MailAgentOptions section
• ✅ Added tip in RegEx testing section about using this setting

Previous Changes:

1. ✅ Added DisableEmailAgeThreshold boolean to MailAgentOptions.cs (defaults to false)
2. ✅ Modified MailService.cs to conditionally skip 15-minute age check when option is enabled
3. ✅ Added startup warning in ConfigurationValidator.cs that displays when threshold is disabled
4. ✅ Updated appsettings.json with default value

Safety Features:

• Defaults to false (production-safe)
• Warning displayed at startup when enabled
• Comprehensive documentation in German (matching existing docs)

Verification:

• ✅ Build successful with no warnings or errors
• ✅ CodeQL security scan passed (0 alerts)
• ✅ Documentation extended per feedback

The implementation is minimal, safe, and fully documented.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Evaluate unread emails that are older than 15 minutes for testing purposes</issue_title>
<issue_description>Setting up regular expressions is complicated. To test them, it's necessary to run tests against older emails. Therefore, it's necessary to have a configuration entry that lets you deactivate the threshold of 15 minutes.
Please make sure a warning is displayed during startup to avoid having this enabled in production mode.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Evaluate unread emails that are older than 15 minutes for testing purposes #14

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[andreaslampe]

@copilot please don't forget to update the configuration and documentation.

[andreaslampe]

@copilot extend the documentation

[Copilot]

@copilot please don't forget to update the configuration and documentation.

Documentation updated in commit 4a7c341. Added comprehensive German documentation to readme.md:

• Added detailed description in the MailAgentOptions configuration section explaining the setting, its purpose for testing RegEx, and warnings about production use
• Added tip in the RegEx testing section pointing users to this setting when testing with older emails

@copilot extend the documentation

Documentation extended in commit 4a7c341. Added:

• Comprehensive documentation in readme.md under MailAgentOptions section
• Tip in ConnectPlain/ConnectEncrypted processor section about using this setting for testing regular expressions
• All documentation in German matching the existing format

[Copilot]

Pull Request Overview

This PR adds a configurable option to bypass the 15-minute email age threshold, enabling testing of regular expressions against older emails. The implementation is production-safe with sensible defaults and includes appropriate warnings.

• Added DisableEmailAgeThreshold configuration option that defaults to false for production safety
• Modified email processing logic to conditionally skip age checks when the option is enabled
• Added startup warning and comprehensive German documentation

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
MailAgent/Options/MailAgentOptions.cs	Adds the DisableEmailAgeThreshold boolean property with a safe default value of false
MailAgent/Services/MailService.cs	Updates email filtering logic to check the configuration before applying the 15-minute age threshold
MailAgent/Services/ConfigurationValidator.cs	Implements a warning that displays at startup when the age threshold is disabled
MailAgent/appsettings.json	Adds the new configuration option with default value false
MailAgent/readme.md	Documents the new setting in both the configuration section and adds a testing tip for regex development

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