I have upgraded to 1.8.20 and now everything works again as expected, thank you for the fast reply!
Unfortunately this release has not fixed the issue. The attachment is now indeed saved, but under a strange name (582dff6f556c7.pdf), not it’s original name. Furthermore, the post is empty and no link to the attachment is added.
Done. When I sent the exact same e-mail that I sent to [email protected] to my site, the described problem happens.
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This reply was modified 9 years, 6 months ago by jthread. Reason: typo