I'm running Debian sid and after upgrading packages today, exim stopped
working.

It's keeping all my local mail in /var/spool/exim4/input and
not delivering it, and even when I type "runq" it won't deliver the
mail.

# exim4 -qff -v
LOG: MAIN
Warning: No server certificate defined; will use a selfsigned one.
Suggested action: either install a certificate or change
tls_advertise_hosts option
LOG: queue_run MAIN
Start queue run: pid=10734 -qff
delivering 1jgC7c-00028M-Af (queue run pid 10734)
R: system_aliases for amber@localhost
R: userforward for amber@localhost
R: procmail for amber@localhost
R: maildrop for amber@localhost
R: lowuid_aliases for amber@localhost (UID 1000)
R: local_user for amber@localhost
T: appendfile for amber@localhost
LOG: MAIN
== amber@localhost R=local_user T=mail_spool defer (-6): mailbox
/var/mail/ has wrong uid (0 != 1000)
LOG: queue_run MAIN
End queue run: pid=10734 -qff


# dpkg -l |grep exim
ii exim4 4.92.3-1
all metapackage to ease Exim MTA (v4) installation
ii exim4-base 4.92.3-1
amd64 support files for all Exim MTA (v4) packages
ii exim4-config 4.94-1
all configuration for the Exim MTA (v4)
ii exim4-daemon-light 4.92.3-1
amd64 lightweight Exim MTA (v4) daemon


In /var/spool/mail, there's a file for my inbox, amber, with amber as
the uid and mail as the gid. This is how it's been for years. The file
/var/spool/mail itself is a link (owned by root, group root) to
/var/mail, which is also root.root.

I also think it's strange that the error says /var/mail has the wrong permissions, not /var/mail/amber. No mailboxes are being delivered to, not just mine.

I tried changing the permissions of /var/mail and then it said "too many links"...

I haven't had a single problem on my system in so long, and this has
me stumped. I appreciate anyone's help - I'd like to get my mail back
asap!

Thanks so much!!