Blank Page When Clicking "Send Mail" Button on Compose Page

[Shadow243]

Description:

When attempting to send an email on the compose page, clicking the "Send Mail" button results in a blank page. This issue occurs consistently and prevents users from successfully sending emails.

Steps to Reproduce:

1. Navigate to the compose page.
2. Fill in the necessary email details (recipient, subject, content, etc.).
3. Click on the "Send Mail" button.
4. Observe that a blank page is displayed instead of the expected action.

Additional Information:

This issue seems to persist across different email service providers, including Migadu.com and potentially others, such as Stalwart.

This issue is critical as it prevents users from sending emails through the application.