dovecot - Nov 2014 - deliver an email to a large number of local users directly via doveadm

Hello,We have a mail service that uses postfix and dovecot. We would like to
send an email to a large number of users(about 100K). However, it takes too long
to send the email through smtp. Is there any solution to deliver the email
locally to all user mailboxes directly.dovecot uses lmtp for transfering local
emails. the worst solutoin is that copy the email to all mailboxes via linux
file system. But we would prefer to use some tools provided by dovecot like
doveadm. is there any way to do this job?

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On Mon, 10 Nov 2014, Mahdi Mahdi wrote:
> Hello,We have a mail service that uses postfix and dovecot. We would 
> like to send an email to a large number of users(about 100K). However, 
> it takes too long to send the email through smtp. Is there any solution 
> to deliver the email locally to all user mailboxes directly.dovecot uses 
> lmtp for transfering local emails. the worst solutoin is that copy the 
> email to all mailboxes via linux file system. But we would prefer to use 
> some tools provided by dovecot like doveadm. is there any way to do this 
> job?
if your mail storage is Maildir and you use virtual users with the same 
uid/gid for all users, the filesystem level is easy going and circumvent 
Sieve:

1) sent the message to yourself,
2) move the message file somewhere, no user can access,
3) remove delivery headers,
4) rename the file, in order to not contain the ":2,"... stuff,
5) for u in *; do ln message_file /home/"$u"/Maildir/new; done

The for loop has to be altered to match your local requirements (path, 
users, ...) though.

====
Alternativly check out if Dovecot LDA works as expected and use it.

- -- 
Steffen Kaiser
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