Steps to reproduce

1. open mail tools app
2. choose an assets to send
3. click send

An error message pops up.

In log following message will be logged:

ERROR info.magnolia.module.mail.app.verify.MailVerifyPresenter 31.03.2023 09:58:01 – Unable to send email.
java.io.FileNotFoundException: blume.jpg (Permission denied)
        at java.io.FileOutputStream.open0(Native Method) ~[?:1.8.0_362]
        at java.io.FileOutputStream.open(FileOutputStream.java:270) ~[?:1.8.0_362]
        at java.io.FileOutputStream.<init>(FileOutputStream.java:213) ~[?:1.8.0_362]
        at java.io.FileOutputStream.<init>(FileOutputStream.java:162) ~[?:1.8.0_362]
        at info.magnolia.module.mail.app.verify.MailVerifyPresenter.sendSimpleMail(MailVerifyPresenter.java:178) [magnolia-module-mail-5.6.jar:?]
        at info.magnolia.module.mail.app.verify.MailVerifyViewImpl$1.buttonClick(MailVerifyViewImpl.java:75) [magnolia-module-mail-5.6.jar:?]

Expected results

Mail should be send with attachments.

Development notes

Reason is that the temp files will be created at root in the filesystem and not in the temporary folder.

While debugging I found the file here: