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>