This reverts commit 07f79af65b ("fix:
markdown rendering improvements").
The revert was applied cleanly with `git revert` and restores the
notification rendering pipeline to its prior state, including:
- `coderd/notifications/dispatch/smtp.go` and `smtp/html.gotmpl`
- `coderd/notifications/notifier.go` and `render/gotmpl.go`
- Removal of `coderd/notifications/render/sanitize_test.go` and
`smtp_internal_test.go` additions
- Regenerated SMTP golden templates under
`coderd/notifications/testdata/`
`go build ./coderd/notifications/...` passes on the reverted tree.
---
_This PR was generated by Coder Agents on behalf of @jdomeracki-coder._
Improvements to markdown rendering in notification emails:
- More consistent escaping of values interpolated into notification templates
- Stricter link handling in the notification email renderer, scoped to the notification rendering path
- HTML escaping of values interpolated into the outer email template
- Expanded unit and end-to-end coverage of the notification rendering pipeline
- `make gen` run to regenerate golden files for SMTP and webhook notification templates
## Description
When configuring a From address with a display name (e.g., `Coder System
<system@coder.com>`), the SMTP `MAIL FROM` command was incorrectly
receiving the full address string instead of just the bare email
address, causing `501 Invalid MAIL argument` errors on some SMTP
servers.
## Changes
- Updated `validateFromAddr` to return both:
- `envelopeFrom`: bare email for SMTP `MAIL FROM` command (RFC 5321)
- `headerFrom`: original address with display name for email header (RFC
5322)
Fixes#20727
Jakub Domeracki