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On Fri, 26 Jul 2013, Martin Burgraf wrote:
I'm using Dovecot together with Postfix; as I understand it, there are two ways
to transfer the mail from Postfix to Dovecot.
1.) by using LDA with mailbox_command = /usr/libexec/dovecot/dovecot-lda -f "$SENDER" -a
"$RECIPIENT"
2.) by using LMTP with mailbox_transport = lmtp:unix:private/dovecot-lmtp
(currently using number 1)
I'm interessted in the differences and the advantages/disadvantages of each of
those solutions.
According to http://wiki2.dovecot.org/LDA the recommended way is to use LMTP,
since it's supposed to have a better performance.
On the other hand, http://wiki2.dovecot.org/LMTP says, that LMTP is a backgound
process, while LDA is only called when needed. I've also read, that LDA only
uses the users privileges, which both means, that LDA should be better.
I've also noticed, that LMTP adds an additional Recieved:-Header to the mail.
Are there any other differences?
LMTP also adds "Delivered-To", unless I'm mistaken.
There is one difference, that pops up on failure: The LDA has the exit
code only to return success/failure back to the MTA. LMTP uses the same
mechanisms as SMTP to return success / failure incl. descriptive
information.
There is another difference, if you need additional hacking: With the
LDA-method you can put a wrapper script between MTA and MDA, in order to
alter the message, recipient, just log something, ... . Actually that
self-made wrapper script [and I really mean script in the sense of bash,
perl, python, C, ruby, ...] can control the delivery fully. That would be
more sophisticated to do with LMTP.
- --
Steffen Kaiser
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