On Fri 14 Aug 2015 09:25:13 NZST +1200, Adrian Mageanu wrote:

[...]

> If this can be achieved with postfix/dovecot

No way, but thay can be part of the solution. You are asking about
incoming emails on different servers, and outgoing emails via different
servers. It seems pretty obvious that you'd have to direct a copy of
each incoming email from each server to a single server, on which you
run an SMTP receiver (there are other ways to copy the emails) and an
IMAP server. To this you connect with your clients. Sending emails via
different accounts is generally an MUA issue, of course it is annoying
to have to configure each of them. If your MUA connects to a single MTA
then it might be possible to configure that MTA to route according to
your mailboxes in use, but I tried a few weeks ago to knock something
trivial of that into postfix and didn't get it to do it as needed, so
will stay with sendmail.

You might find it easier to move all your mailboxes to a single server.
Easier organisation, single point of failure. You might find procmail
and rsync very useful too.

I'd be very keen to hear of other solutions too.

HTH,

Volker

-- 
Volker Kuhlmann
http://volker.top.geek.nz/      Please do not CC list postings to me.
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