dovecot - Apr 2013 - Using dsync to export mail to remote IMAP account

I've read the web/man pages on dsync, but it's not clear to me whether
dsync can be used to export (rather than import) a user's mailbox to a
remote non-dovecot IMAP account.

(The intention is to use it whenever a user leaves and wants to copy their
local mail to Google or whatever.  I currently use uw-imapd's mailutil --
it works, but it's dreadfully slow.)

As a first crack at it, I tried (on the dovecot server)

 	dsync	-o imapc_user=remoteuser
 		-o imapc_password=remotepassword
 		-o imapc_host=remote-imap-server
 		-o imapc_port=993
 		-o imapc_ssl=imaps
 		-o imapc_features=rfc822.size
 		-o imapc_list_prefix=remoteprefix
 		-o mailbox_list_index=no
 		backup -f -u localuser imapc:

I got this error:

 	dsync(localuser): Error: user localuser: Initialization failed:
 		Namespace '': Unknown mail storage driver imapc
 	dsync(localuser): Fatal: User init failed

Is exporting mail to a remote (non-dovecot) IMAP account even doable with dsync,
or
am I completely off-track?

Joseph Tam <jtam.home at gmail.com>

On 23/04/2013 12:56 PM, Joseph Tam wrote:
>
>
> I've read the web/man pages on dsync, but it's not clear to me
whether
> dsync can be used to export (rather than import) a user's mailbox to a
> remote non-dovecot IMAP account.
>
> (The intention is to use it whenever a user leaves and wants to copy 
> their
> local mail to Google or whatever.  I currently use uw-imapd's mailutil
--
> it works, but it's dreadfully slow.)
>
> As a first crack at it, I tried (on the dovecot server)
>
>     dsync    -o imapc_user=remoteuser
>         -o imapc_password=remotepassword
>         -o imapc_host=remote-imap-server
>         -o imapc_port=993
>         -o imapc_ssl=imaps
>         -o imapc_features=rfc822.size
>         -o imapc_list_prefix=remoteprefix
>         -o mailbox_list_index=no
>         backup -f -u localuser imapc:
>
> I got this error:
>
>     dsync(localuser): Error: user localuser: Initialization failed:
>         Namespace '': Unknown mail storage driver imapc
>     dsync(localuser): Fatal: User init failed
>
> Is exporting mail to a remote (non-dovecot) IMAP account even doable 
> with dsync, or
> am I completely off-track?
>
> Joseph Tam <jtam.home at gmail.com>
>
> -- 
No I think dsync only works with dovecot servers.

I find LARCH works best for what you are trying to do:

https://github.com/rgrove/larch

On Mon, 2013-04-22 at 19:56 -0700, Joseph Tam wrote:
> 
> I've read the web/man pages on dsync, but it's not clear to me
whether
> dsync can be used to export (rather than import) a user's mailbox to a
> remote non-dovecot IMAP account.
It should be possible at some point, but currently probably won't work
very well.
> I got this error:
> 
>  	dsync(localuser): Error: user localuser: Initialization failed:
>  		Namespace '': Unknown mail storage driver imapc
>  	dsync(localuser): Fatal: User init failed
But this looks like you simply haven't compiled Dovecot with imapc
support. See if

dovecot --build-options|grep storage

returns imapc.

Timo Sirainen writes:
>> I've read the web/man pages on dsync, but it's not clear to me
whether
>> dsync can be used to export (rather than import) a user's mailbox
to a
>> remote non-dovecot IMAP account.
>
> It should be possible at some point, but currently probably won't work
> very well.
Ah, thanks for the clarification.
>>  	dsync(localuser): Error: user localuser: Initialization failed:
>>  		Namespace '': Unknown mail storage driver imapc
>>  	dsync(localuser): Fatal: User init failed
>
> But this looks like you simply haven't compiled Dovecot with imapc
> support. See if
>
> dovecot --build-options|grep storage
>
> returns imapc.
Right you are.

Joseph Tam <jtam.home at gmail.com>