Hello:

In the process of migration from version 1.2 to 2.0 have tried to use lmtp instead of lda as delivery agent.

But unfortunately througput we get is poor with lmtp compared to lda. In peak times with lda we are able to deliver over 1800 messages/minute (high I/O but not affecting service) but if we switch to lmtp cannot deliver more than 300 mess/minute (very low I/O).

This is enough for normal work but low under heavy load (distribution lists messages sometimes stay queued for 4 hours before deliver).

We have arround 50000 boxes and use postfix as MTA

How to increase lmtp performance?

dovecot config for lda and lmtp:

protocol lda { auth_socket_path = /usr/local/var/run/dovecot/auth-master info_log_path = /var/log/mail/dovecot_deliver.log log_path = /var/log/mail/dovecot_deliver.log mail_plugins = quota sieve zlib postmaster_address = postmaster@upm.es sendmail_path = /usr/lib/sendmail }

protocol lmtp { info_log_path = /var/log/mail/dovecot_deliver.log log_path = /var/log/mail/dovecot_deliver.log mail_plugins = quota sieve zlib postmaster_address = postmaster@upm.es sendmail_path = /usr/lib/sendmail }

In postfix I have:

mailbox_transport = lmtp:unix:private/dovecot-lmtp

Thanks in advance.

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Juan Carlos Sanchez Hernandez Universidad Politecnica de Madrid