On 13 Jun 2019, at 14:47, @lbutlr wrote:

> What sort of configuration change would I need to do to use LMTP instead of 
> LDA?

Regarding dovecot, all you need to do is following:

<https://wiki.dovecot.org/LMTP>
<https://wiki.dovecot.org/HowTo/PostfixDovecotLMTP> (if postfix is your MTA)
<https://wiki.dovecot.org/LMTP/Exim> (if exim is your MTA)

> And are there any downsides?

Not that I’m aware of. Things remained the same as when I was using LDA but 
using LMTP over Dovecot’s LDA brings some advantages like better performances 
(no need to fire up new processes for deliveries) among others one.

There were several threads on the list related to LDA vs LMTP, such as:

<https://dovecot.org/pipermail/dovecot/2016-June/104670.html>
<https://dovecot.org/list/dovecot/2013-July/091617.html>

> What do I do about
>
> lda_mailbox_autocreate = yes
> lda_mailbox_autosubscribe = yes
>
> ?

They’re also used by LMTP so no need to worry when migrating from LDA to LMTP.
You can check what LDA’s options are specifically also used by LMTP in 
examples/conf.d/15-lda.conf

-- 
matt [at] lv223.org
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