[Dovecot] How to troubleshoot LDA or LMTP?

[Steffen Kaiser]

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On Thu, 8 Aug 2013, John Williams wrote:

>> in order to not filter the same message twice or re-filter messages,
>> you've moved around manually?
> That is not a problem.  The filtering process works perfectly when I
> manually invoke dovecot-lda.  My problem is that I have followed the
> instructions here:
>
> http://wiki2.dovecot.org/LDA/
>
> and here:
>
> http://wiki2.dovecot.org/LDA/Sendmail
>
> and here:
>
> http://wiki2.dovecot.org/LMTP
>
> but neither dovecot-lda nor LMTP seem to be triggered whenever I send
> email from my MUA (Gnus).  At least, I *think* I have followed the
> instructions correctly.  Would you like me to post my dovecot config
> again, and the relevant portion of sendmail.cf?
>
> Thank you very much for your help, I truly appreciate it.

As Stan already pointed out: a local delivery takes place only, when the 
mail arrives via a MTA. offlineimap synchronizes two IMAP folders, there 
is no local delivery at your side at all. Hence, neither LDA nor LMTP is 
invoked.

So I see two ways:

1) keep offlineimap to resync your local store back to the server and keep 
both in-sync.

Then you can:
1a) run offlineimap to get new messages from the upstream server and sync 
current local messages.
1b) remove the new ones from the local store and feed them _manually_ to 
the LDA or LMTP. Now the filtering takes place and they are re-added to 
the mail storage.
1c) maybe: re-run the process until no new messages got downloaded, in 
order to keep the server in-sync

2) no need for server messages in-sync with local message store

2a) setup a local MTA that accepts your domain and drops messages via 
Dovecot LDA or LMTP. Then get the new messages via fetchmail on a regular 
basis and hand the messages over to the local MTA.

2b) use fetchmail in combination with Dovecot LDA/LMTP. No local MTA 
necessary.

fetchmail will see only messages in INBOX as far as I know. So no 
filtering on the server must take place.

- -- 
Steffen Kaiser
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