Modify /etc/cyrus.conf to:

START {
  recover       cmd="ctl_cyrusdb -r"
  deliver       cmd="ctl_deliver -r"
}

SERVICES {
  imap          cmd="imapd" listen="imap" prefork=0
  #  imaps                cmd="imapd -s" listen="imaps" prefork=0
  pop3          cmd="pop3d" listen="pop3" prefork=0
  #  pop3s                cmd="pop3d -s" listen="pop3s" prefork=0
  sieve         cmd="timsieved" listen="sieve" prefork=2
  # entry must be the same as in the mailbox_transport-setting of /etc/postfix/main.cf !
  lmtpunix      cmd="lmtpd" listen="/var/spool/postfix/public/lmtp" prefork=1
}

EVENTS {
  checkpoint    cmd="ctl_cyrusdb -c" period=30
  # die Verwendung von "at=Uhrzeit im 24h-Format" setzt den Wert von
  # "period" implizit auf 1440 (24 Std. bzw. taeglich)
  #delprune      cmd="cyr_expire -E 3" at=0400
  # delprune      cmd="cyr_deliver -E 3" period=1440
  tlsprune      cmd="tls_prune" at=0400
  # tlsprune      cmd="ctl_deliver -E 3" period=1440
  # cleanup      cmd="ipurge -d 30 -f" period=60
}

Modify your /etc/imapd.conf to:

configdirectory: /var/lib/imap
partition-default: /var/spool/imap
admins: cyrus
#defaultacl: anyone lrsp
allowanonymouslogin: no
# 2007-05-04, chhaas:
#allowplaintext: yes
# 17.01.2007, chhaas: 100 MB Mailboxgroesse
autocreatequota: 100000
reject8bit: no
# 17.01.2007, chhaas: 70% Mailboxfuellung fuer Quota-Warung
quotawarn: 70
timeout: 300
poptimeout: 10
dracinterval: 0
drachost: localhost
sasl_pwcheck_method: saslauthd
#sasl_auth_mech: MD5
sasl_minimum_layer: 0
#sasl_maximum_layer: 1
sasl_mech_list: PLAIN LOGIN
# 17.01.2007, chhaas: Fehlermeldung an Postfix, wenn Mailbox voll
lmtp_overquota_perm_failure: yes
lmtp_downcase_rcpt: yes
# entry must be the same as in the mailbox_transport-setting of /etc/postfix/main.cf !
lmtpsocket: /var/spool/postfix/public/lmtp
sievedir: /var/lib/sieve
# 2007-06-28, chhaas: TEST!
sievenotifier: log

—- alternative entries:

allowplaintext: yes
servername: station7.example.com
defaultdomain: example.com
loginrealms: example.com
virtdomains: yes
hashimapspool: true

station7:/ # imtest -a root -u root -m LOGIN station7.example.com
S: * OK station7 Cyrus IMAP4 v2.2.12 server ready
C: C01 CAPABILITY
S: * CAPABILITY IMAP4 IMAP4rev1 ACL QUOTA LITERAL+ MAILBOX-REFERRALS NAMESPACE UIDPLUS ID NO_ATOMIC_RENAME UNSELECT CHILDREN MULTIAPPEND BINARY SORT THREAD=ORDEREDSUBJECT THREAD=REFERENCES ANNOTATEMORE IDLE X-NETSCAPE
S: C01 OK Completed
Please enter your password:
C: L01 LOGIN root {6}
S: + go ahead
C: <omitted>
S: L01 OK User logged in
Authenticated.
Security strength factor: 0

Use a portscanner like “nmap”:
station7:/ # nmap localhost | grep imap

143/tcp  open  imap

→ imap is running at port 143

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