Explanation for mail_queue_enter: create file maildrop/870989.992: Read-only file system ¶ Sunday, May 10, 2026 Here is what happened after mail_queue_enter: create file maildrop/870989.992: Read-only file system . NB I am still unable to send emails to the debian-user mailinglist. I sent an email to listmaster lists debian org , but they too didn’t respond. That’s another story. EDIT: I thought…