Mail app v4.3.6 does not show full content of Nextcloud Webinar invitations

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:lady_beetle: Bug report: Mail app v4.3.6 does not show full content of Nextcloud Webinar invitations

App: Mail
Version: 4.3.6
Nextcloud version: AIO v10.11.0 (Hub 9 – 30.0.8)
OS: CachyOS (Linux)
Browsers tested: Brave (latest), Firefox (latest)

:exclamation: Problem:

The Mail app fails to display the entire content of Nextcloud webinar invitation emails.

Only the upper part of the email body is visible in the preview pane. The rest of the message is cut off and inaccessible.
There is no scroll bar, no “Show more” button, and no way to view the entire email inside the Mail app.

Other emails from different senders display correctly, so this issue appears to be specific to the formatting of webinar invitations from Nextcloud (e.nextcloud.com).

:camera: Screenshots:

issue-20250409
issue-202504091914×907 208 KB

issue-20250409-02
issue-20250409-021908×750 141 KB

:test_tube: Steps to reproduce:

  1. Open the Mail app.
  2. Locate any email from updates@e.nextcloud.com related to a webinar.
  3. Try to read the full content.
  4. Observe that only the top part is visible and the rest is missing.

:white_check_mark: Expected behavior:

All HTML emails, including marketing or webinar invites, should:

  • be fully rendered inside the Mail app, or
  • at least offer a way to open the full content (e.g. scroll, expand, external window, etc.)

:mag: Additional info:

  • This issue appears to affect emails formatted by marketing tools (possibly Mailchimp or similar).
  • Viewing the same email in Thunderbird or other IMAP clients works without issues.
  • May be related to CSS overflow, height restrictions, or iframe-style rendering in Mail app.