Yes, by lmtp from Exim4
Currently running 3.4.3 (Debian's bullseye backport).
/etc/cyrus.conf has idled started in the START section:
START {
# do not delete this entry!
recover cmd="/usr/sbin/cyrus ctl_cyrusdb -r"
# this is only necessary if idlemethod is set to "idled" in imapd.conf
idled cmd="idled"
# this is useful on backend nodes of a Murder cluster
# it causes the backend to synchronize its mailbox list with
# the mupdate master upon startup
#mupdatepush cmd="/usr/sbin/cyrus ctl_mboxlist -m"
# this is recommended if using duplicate delivery suppression
delprune cmd="/usr/sbin/cyrus expire -E 3"
# this is recommended if caching TLS sessions
tlsprune cmd="/usr/sbin/cyrus tls_prune"
}
Nothing special in syslog, the message was delivered:
Jun 24 09:51:50 mailhk1 cyrus/lmtpunix[824728]: Delivered: <CAMPC4a=2WjeOOj5C__rhKp+A+u8qdE8LeP9wx5Up18qoRjmugg@xxxxxxxxxxxxxx> to mailbox: user.andrew Jun 24 09:51:50 mailhk1 cyrus/lmtpunix[824728]: USAGE andrew user: 0.003437 sys: 0.006875
Andrew
