Image in new mail template wrong ratio

[simonhir]

Describe the bug
A email sent with the new message template via the email integration shows the header image as 1:1 ratio instead of the original ratio. This bug only seems to occur in Outlook, Mailhog and OWA shows the image correct.

To Reproduce
Send email with email-with-logo example process.

Expected behavior
The image is shown in its original ratio as in normal web browsers.

Additional context

• New email template introduced with Mail: Bilder und Links in Mails #1277

[markostreich]

Integrationstest erfolgreich.