[Dovecot] How to troubleshoot LDA or LMTP?

[Sam Flint]

Gnus supports IMAP natively, and even ManageSieve.  Use that, don't
run a proxy, it's a lot easier.

On Thu, Aug 8, 2013 at 4:19 AM, Steffen Kaiser
<skdovecot at smail.inf.fh-brs.de> wrote:
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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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-- 
Sam Flint
flintfam.org/~swflint