Re: [Dovecot] dovecot & OCFS2 Cluster
Robert Schetterer <robert@schetterer.org> writes:
Anyway, why use lmtp over lda ?
i.e avoid backscatter by overquota
A clarification on this: backscatter (or rather, ambiguous NDR notices that claim many users are over quota rather than just one) is a result of a local mailer that support multiple recipient delivery in one invocation, but can only return one result code to the MTA.
Since Dovecot's deliver-lda does not support multiple recipient delivery, this is not a problem.
LMTP can support multiple deliveries of the same message per invocation, but replies with individual SMTP codes to avoid the above problem. It can take advantage of this to efficiently implement single instance storage if it is enabled.
performance should better too
Apart from multiple deliveries or SIS, I'm not sure this is true, or significant if it were.
Joseph Tam <jtam.home@gmail.com>
Hi all
I decided to upgrade to 2.0 i compiled dovecot with ssl and mysql, but i have problems with lmtp configuration. this is the error.
pr 27 01:04:36 debian dovecot: auth: Fatal: net_connect_unix(auth-worker) in directory /usr/local/dovecot/var/run/dovecot failed: Permission denied (euid=65534(nobody) egid=65534(nogroup) missing +r perm: auth-worker, euid is not dir owner) Apr 27 01:04:36 debian dovecot: lmtp(25961): Error: userdb lookup(user@exemple.org): Disconnected unexpectedly Apr 27 01:04:36 debian dovecot: master: Error: service(auth): command startup failed, throttling
dovecot.conf auth_mechanisms = plain login disable_plaintext_auth = no first_valid_uid = 5000 last_valid_uid = 5000 mail_access_groups = mail mail_location = maildir:/var/vmail/%d/%u/Maildir ssl = no
passdb { args = /etc/dovecot/sql.conf driver = sql } plugin { quota = maildir:User quota } protocols = imap pop3 lmtp service auth { unix_listener auth-userdb { group = mail mode = 0660 user = vmail } unix_listener /var/spool/postfix/private/auth { group = mail mode = 0660 user = postfix } user = nobody } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0660 user = postfix } }
userdb { driver = prefetch } userdb { args = /etc/dovecot/sql.conf driver = sql } protocol imap { imap_client_workarounds = delay-newmail mail_plugins = quota imap_quota } protocol pop3 { mail_plugins = quota pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_uidl_format = %08Xu%08Xv }
!include conf.d/*.conf
20-lmtp.conf
protocol lmtp { # Space separated list of plugins to load (default is global mail_plugins). #mail_plugins = $mail_plugins postmaster_address = admin@exemple.org }
I think is a permisson problem, in the conf i set group = mail mode = 0660 user = vmail i should not have problems, rigth?
Thanks you all
2011/4/27 Joseph Tam <jtam.home@gmail.com>:
Robert Schetterer <robert@schetterer.org> writes:
Anyway, why use lmtp over lda ?
i.e avoid backscatter by overquota
A clarification on this: backscatter (or rather, ambiguous NDR notices that claim many users are over quota rather than just one) is a result of a local mailer that support multiple recipient delivery in one invocation, but can only return one result code to the MTA.
Since Dovecot's deliver-lda does not support multiple recipient delivery, this is not a problem.
LMTP can support multiple deliveries of the same message per invocation, but replies with individual SMTP codes to avoid the above problem. It can take advantage of this to efficiently implement single instance storage if it is enabled.
performance should better too
Apart from multiple deliveries or SIS, I'm not sure this is true, or significant if it were.
Joseph Tam <jtam.home@gmail.com>
Am 27.04.2011 00:50, schrieb Joseph Tam:
Robert Schetterer <robert@schetterer.org> writes:
Anyway, why use lmtp over lda ?
i.e avoid backscatter by overquota
A clarification on this: backscatter (or rather, ambiguous NDR notices that claim many users are over quota rather than just one) is a result of a local mailer that support multiple recipient delivery in one invocation, but can only return one result code to the MTA.
Since Dovecot's deliver-lda does not support multiple recipient delivery, this is not a problem.
LMTP can support multiple deliveries of the same message per invocation, but replies with individual SMTP codes to avoid the above problem. It can take advantage of this to efficiently implement single instance storage if it is enabled.
in my understanding lmtp acts more like a mta so overquota "reject" can be send during smtp income stage i.e with postfix, to the sender client
with lda this isnt possible cause the the mta does give the whole mail to lda which and mta send "recieved" to the sender client ( so the bounce must be send later by binary sendmail etc )
whatever this is the behavior i ve tested in my setups, may Timo correct me if i fail here
performance should better too
Apart from multiple deliveries or SIS, I'm not sure this is true, or significant if it were.
yes this should be meassured, youre right i dont know too if its really performance relevant, but multiple deliver is nice to have anyway, why should not use it
Joseph Tam <jtam.home@gmail.com>
however i see no reason to use lda longer in my setups as lmtp exits youre right the backscatter case is really rare anyway
Best Regards
MfG Robert Schetterer
Germany/Munich/Bavaria
participants (3)
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Joseph Tam
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Osvaldo Alvarez Pozo
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Robert Schetterer