When mails are sent via attachment, the attachment is displayed empty in both preview and opened window if
- the attached mail is written in text-only format and is signed and/or encrypted
- the attached mail has encrypted attachments
I have generated mails with all permutations of outlook formats (html, rich, text) * (un)signed * (un)encrypted and sent them via attachment in various ways. Sending the attachments signed and/or encrypted does not matter, neither if it's a single or multiple attachements. In all cases the empty display in the preview / opened window is the same. This behaviour can be seen e.g. in the following attachments of the mail `Ted:INBOX/Anhänge/attached unsigned unencrypted: all mailformats (15:07)`:
- `TEXT signed unencrypted`
- `TEXT unsigned encrypted`
- `TEXT signed encrypted`
{F27506804}
Additionally attaching mails with encrypted attachments (does not matter if signed or not) leads to the same behaviour, which can be seen in the following attachments of the mail `Ted:INBOX/Anhänge/attached unsingned unencrypted: all attachment mails (16:30)`:
- `attached unsigned encrypted: all mailformats`
- `attached signed encrypted: all mailformats`
{F27506751}
Notes:
- `RICH/HTML` and `encrypted` attachements are displayed with their own `openpgp-encrypted-message.asc` attachment, which in turn can be opened fine (although it's displayed via Kleopatra and only as text not html). Not sure, if this is the expected behaviour
{F27506534}