iOS Mail app does not show attachments (multipart/related and mixed handling)

Description

Steps to reproduce:

1. Send a manual email with attachments to a dummy customer.
2. As a dummy customer open your inbox on an iphone using bundled email client.
3. Open sent email.

Expected result:
All attachments are presents in the email

Actual result:
No attachments are present even though attachment indicator (a paperclip) can be seen in the inbox next to the test email (see screenshots)

3rd party email clients like 'Spark' display attachments just fine, not the bundled one however.

Environment

None

Status

Assignee

Tibor Hegyi

Reporter

Tibor Hegyi

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Access to limited visibility issues

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Fix versions

Priority

Major
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