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
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 ( http://nmap.org ) 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