* Relax from check
- Print a warning instead of an error, if envelope_from is set.
- In case of an error, provide a hint about envelope_from.
* Potential fix for pull request finding
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
* Misc. fixes
- Do not expose 'username' to a potential recipient.
- Make 'from' mandatory, because there is no fallback anymore.
- Validate 'from' to make shure, it contains an email address.
- Avoid namespace pollution: Use let instead of var.
* Suggested changes from codereview
