feat: Add ENV option to enable subject line logging #68

[linucksrox]

Creating a Pull Request

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Description of the change

Resolves issue #68 This simply allows you to pass LOG_SUBJECT=yes as an environment variable in order to enable outputting the subject line in the logs.

Motivation and Context

I like to see the subject line in the logs to help identify messages.

How Has This Been Tested?

Since this change affects a file that also is related to SMTP_HEADER_TAG, I tested 4 scenarios:

1. setting neither SMTP_HEADER_TAG or LOG_SUBJECT
2. setting only SMTP_HEADER_TAG but not LOG_SUBJECT
3. setting only LOG_SUBJECT=yes but not SMTP_HEADER_TAG
4. setting both SMTP_HEADER_TAG and LOG_SUBJECT=yes

Types of Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Documentation (adding or updating documentation)

Checklist:

• [x] My change requires a change to the documentation and I have updated the documentation accordingly.
• [x] My change adds a new configuration variable and I have updated the .env.example file accordingly.

And lastly, many thanks for taking your time to help us improve this project !

[juanluisbaptiste]

Hi @linucksrox I'm sorry for the late reply, I will try to review this this week.

[juanluisbaptiste]

@linucksrox merged, apologies for the delay.

[linucksrox]

@juanluisbaptiste Thanks!