Sendmail/Cyrus-imapd/lmtp problem

Posted on 2009-04-05
Last Modified: 2013-12-17
I have (had) a working email environment withe Sendmail 8.13.8 and cyrus-imapd 2.3.7. System is CentOS 5.2

Local mail is not being delivered:
Running /var/spool/mqueue/n352XCtg004074 (sequence 1 of 1)
<>... Connecting to /var/imap/socket/lmtp via cyrusv2...
Could not connect to socket /var/imap/socket/lmtp: Connection refused by localhost
<>... Deferred: Connection refused by localhost

from maillog:
Apr  5 14:21:28 europa sendmail[3626]: n352XCtg004074: to=<>, delay=15:48:16, xdelay=00:00:00, mailer=cyrusv2, pri=309                      3798, relay=localhost, dsn=4.4.1, stat=Deferred: Connection refused by localhost

Question by:MoonsOfJupiter
  • 7
  • 3

Author Comment

ID: 24072658
# standard standalone server implementation


  # do not delete this entry!

  recover       cmd="ctl_cyrusdb -r"

  # this is only necessary if using idled for IMAP IDLE

  idled         cmd="idled"


# UNIX sockets start with a slash and are put into /var/lib/imap/sockets


  # add or remove based on preferences

  imap          cmd="imapd" listen="imap" prefork=5

  imaps         cmd="imapd -s" listen="imaps" prefork=1

  pop3          cmd="pop3d" listen="pop3" prefork=3

  pop3s         cmd="pop3d -s" listen="pop3s" prefork=1

  sieve         cmd="timsieved" listen="sieve" prefork=0

  # these are only necessary if receiving/exporting usenet via NNTP

#  nntp         cmd="nntpd" listen="nntp" prefork=3

#  nntps                cmd="nntpd -s" listen="nntps" prefork=1

  # at least one LMTP is required for delivery

#  lmtp         cmd="lmtpd" listen="lmtp" prefork=0

  lmtpunix      cmd="lmtpd" listen="/var/imap/socket/lmtp" prefork=1

  # this is only necessary if using notifications

#  notify       cmd="notifyd" listen="/var/lib/imap/socket/notify" proto="udp" prefork=1



  # this is required

  checkpoint    cmd="ctl_cyrusdb -c" period=30

  # this is only necessary if using duplicate delivery suppression,

  # Sieve or NNTP

  delprune      cmd="cyr_expire -E 3" at=0400

  # this is only necessary if caching TLS sessions

  tlsprune      cmd="tls_prune" at=0400


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Author Comment

ID: 24072665

dnl #

dnl # This is the sendmail macro config file for m4. If you make changes to

dnl # /etc/mail/, you will need to regenerate the

dnl # /etc/mail/ file by confirming that the sendmail-cf package is

dnl # installed and then performing a

dnl #

dnl #     make -C /etc/mail

dnl #


VERSIONID(`setup for linux')dnl


dnl #

dnl # Do not advertize sendmail version.

dnl #

dnl define(`confSMTP_LOGIN_MSG', `$j Sendmail; $b')dnl

dnl #

dnl # default logging level is 9, you might want to set it higher to

dnl # debug the configuration

dnl #

dnl define(`confLOG_LEVEL', `9')dnl

dnl #

dnl # Uncomment and edit the following line if your outgoing mail needs to

dnl # be sent out through an external mail server:

dnl #

dnl define(`SMART_HOST', `smtp.your.provider')dnl

dnl #

define(`confDEF_USER_ID', ``8:12'')dnl

define(`confTRUSTED_USER', `cyrus')dnl

define(`confLOCAL_MAILER', `cyrusv2')dnl

dnl define(`confAUTO_REBUILD')dnl

define(`confTO_CONNECT', `1m')dnl

define(`confTRY_NULL_MX_LIST', `True')dnl

define(`confDONT_PROBE_INTERFACES', `True')dnl

define(`PROCMAIL_MAILER_PATH', `/usr/bin/procmail')dnl

define(`ALIAS_FILE', `/etc/aliases')dnl

define(`STATUS_FILE', `/var/log/mail/statistics')dnl

define(`UUCP_MAILER_MAX', `2000000')dnl

define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl

define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl

define(`confAUTH_OPTIONS', `A')dnl

dnl #

dnl # The following allows relaying if the user authenticates, and disallows

dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links

dnl #

dnl define(`confAUTH_OPTIONS', `A p')dnl

dnl #

dnl # PLAIN is the preferred plaintext authentication method and used by

dnl # Mozilla Mail and Evolution, though Outlook Express and other MUAs do

dnl # use LOGIN. Other mechanisms should be used if the connection is not

dnl # guaranteed secure.

dnl # Please remember that saslauthd needs to be running for AUTH.

dnl #



dnl #

dnl # Rudimentary information on creating certificates for sendmail TLS:

dnl #     cd /usr/share/ssl/certs; make sendmail.pem

dnl # Complete usage:

dnl #     make -C /usr/share/ssl/certs usage

dnl #

dnl define(`confCACERT_PATH', `/etc/pki/tls/certs')dnl

dnl define(`confCACERT', `/etc/pki/tls/certs/ca-bundle.crt')dnl

dnl define(`confSERVER_CERT', `/etc/pki/tls/certs/sendmail.pem')dnl

dnl define(`confSERVER_KEY', `/etc/pki/tls/certs/sendmail.pem')dnl

dnl #

dnl # This allows sendmail to use a keyfile that is shared with OpenLDAP's

dnl # slapd, which requires the file to be readble by group ldap

dnl #

dnl define(`confDONT_BLAME_SENDMAIL', `groupreadablekeyfile')dnl

dnl #

dnl define(`confTO_QUEUEWARN', `4h')dnl

dnl define(`confTO_QUEUERETURN', `5d')dnl

dnl define(`confQUEUE_LA', `12')dnl

dnl define(`confREFUSE_LA', `18')dnl

define(`confTO_IDENT', `0')dnl

dnl FEATURE(delay_checks)dnl

FEATURE(`no_default_msa', `dnl')dnl

FEATURE(`smrsh', `/usr/sbin/smrsh')dnl

FEATURE(`mailertable', `hash -o /etc/mail/mailertable.db')dnl

FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl





dnl #

dnl # The following limits the number of processes sendmail can fork to accept

dnl # incoming messages or process its message queues to 20.) sendmail refuses

dnl # to accept connections once it has reached its quota of child processes.

dnl #

dnl define(`confMAX_DAEMON_CHILDREN', `20')dnl

dnl #

dnl # Limits the number of new connections per second. This caps the overhead

dnl # incurred due to forking new sendmail processes. May be useful against

dnl # DoS attacks or barrages of spam. (As mentioned below, a per-IP address

dnl # limit would be useful but is not available as an option at this writing.)

dnl #

dnl define(`confCONNECTION_RATE_THROTTLE', `3')dnl

dnl #

dnl # The -t option will retry delivery if e.g. the user runs over his quota.

dnl #

dnl FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl

FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl



dnl #

dnl # For using Cyrus-IMAPd as POP3/IMAP server through LMTP delivery uncomment

dnl # the following 2 definitions and activate below in the MAILER section the

dnl # cyrusv2 mailer.

dnl #

dnl define(`confLOCAL_MAILER', `cyrusv2')dnl

dnl undefine(`CYRUSV2_MAILER_ARGS')

dnl FEATURE(`local_lmtp')dnl

dnl FEATURE(`preserve_local_plus_detail')dnl

dnl #

dnl # The following causes sendmail to only listen on the IPv4 loopback address

dnl # and not on any other network devices. Remove the loopback

dnl # address restriction to accept email from the internet or intranet.

dnl #

dnl DAEMON_OPTIONS(`Port=smtp,Addr=, Name=MTA')dnl

dnl #

dnl # The following causes sendmail to additionally listen to port 587 for

dnl # mail from MUAs that authenticate. Roaming users who can't reach their

dnl # preferred sendmail daemon due to port 25 being blocked or redirected find

dnl # this useful.

dnl #

dnl DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl

dnl #

dnl # The following causes sendmail to additionally listen to port 465, but

dnl # starting immediately in TLS mode upon connecting. Port 25 or 587 followed

dnl # by STARTTLS is preferred, but roaming clients using Outlook Express can't

dnl # do STARTTLS on ports other than 25. Mozilla Mail can ONLY use STARTTLS

dnl # and doesn't support the deprecated smtps; Evolution <1.1.1 uses smtps

dnl # when SSL is enabled-- STARTTLS support is available in version 1.1.1.

dnl #

dnl # For this to work your OpenSSL certificates must be configured.

dnl #

dnl DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl

dnl #

dnl # The following causes sendmail to additionally listen on the IPv6 loopback

dnl # device. Remove the loopback address restriction listen to the network.

dnl #

dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')dnl

dnl #

dnl # enable both ipv6 and ipv4 in sendmail:

dnl #

dnl DAEMON_OPTIONS(`Name=MTA-v4, Family=inet, Name=MTA-v6, Family=inet6')

dnl #

dnl # We strongly recommend not accepting unresolvable domains if you want to

dnl # protect yourself from spam. However, the laptop and users on computers

dnl # that do not have 24x7 DNS do need this.

dnl #


dnl #

dnl FEATURE(`relay_based_on_MX')dnl

dnl #

dnl # Also accept email sent to "localhost.localdomain" as local email.

dnl #


dnl #

dnl # The following example makes mail from this host and any additional

dnl # specified domains appear to be sent from

dnl #

dnl MASQUERADE_AS(`')dnl

dnl #

dnl # masquerade not just the headers, but the envelope as well

dnl #

dnl FEATURE(masquerade_envelope)dnl

dnl #

dnl # masquerade not just, but @* as well

dnl #

dnl FEATURE(masquerade_entire_domain)dnl

dnl #

dnl MASQUERADE_DOMAIN(localhost)dnl

dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl


dnl MASQUERADE_DOMAIN(mydomain.lan)dnl


dnl MAILER(procmail)dnl



dnl FEATURE(`local_lmtp')dnl

dnl FEATURE(`preserve_local_plus_detail')dnl

dnl define(`CYRUSV2_MAILER_FLAGS', `uA@/:|m')dnl

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Author Comment

ID: 24072668
configdirectory: /var/lib/imap

partition-default: /var/spool/imap

admins: cyrus

sievedir: /var/lib/imap/sieve

sendmail: /usr/sbin/sendmail

hashimapspool: true

sasl_pwcheck_method: saslauthd

sasl_mech_list: PLAIN

tls_cert_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem

tls_key_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem

tls_ca_file: /etc/pki/tls/certs/ca-bundle.crt

servername: localhost.localdomain

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Author Comment

ID: 24072669
[root@europa ~]# ls -l /var/imap/socket/
total 4
-rwxr-xr-x 1 cyrus mail 0 Apr  5 13:32 lmtp
LVL 13

Accepted Solution

WizRd-Linux earned 500 total points
ID: 24073219
Out of curiosity, try the command : "file /var/imap/socket/lmtp"  This should return lmtp: socket, if it doesn't this indicates that the socket setup is broken.  If it doesn't say it is a socket, stop everything, remove the file if it still exists and start everything up again.

Other than that I can't see anything that is blatently obvious.
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Author Comment

ID: 24073251
No its not a socket -- i deleted it once and it didn;t come back. The lmtp file that's there now is because I did a created it manually.

If I delete and restart sednmail and cyrus-imapd, it doesn't get created automatically.

Author Comment

ID: 24073378
Ok the socket is here:


which I guess is the default location. When I set everything up I found several instances of note that this should be changed to /var/imap/socket. I bunch of updates ran last night and maybe something caused the switch back to the defualt location. Once I updated the /etc/cyrus.conf and athe files to reflect that everything started working again.

LVL 13

Expert Comment

ID: 24073429
As you are using Centos, the easiest way to check is rpm -ql postfix (postfix normally owns the lmtp file.

An upgrade may have caused this if the package maintainer has "moved" the location of the file.
LVL 13

Expert Comment

ID: 24073499
Sorry, through habit I typed postfix, it should have been sendmail.

If it doesn't display anything relating to the lmtp file, use rpm -qf /var/imap/socket/lmtp.

If this is from one of the updates then you know this was the cause.

Author Comment

ID: 24076725
Nope -- I get nothing with any of those queries.

I'm going to leave the socket where it wants to be: /var/lib/imap/socket/lmtp.

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