dovecot - Oct 2020 - Looking for a guide to collect all e-mail from the ISP mail server

> Your goal does not sound weird.
OK, thanks for the confirmation.

> The most painless way might be to fetch incoming messages from
> the ISP's IMAP and deliver them to your local dovecot. 
> A shortened fetchmailrc would read:
> 
> poll remote.server ?
>  ? user ?, password ?
>  ? folder 'INBOX'
>  ? fetchall
>  ? idle
>  ? ssl
> mda "HOME=%T /usr/bin/sudo -u %T /usr/lib/dovecot/deliver"
Brilliant, thanks for the info.

> That way your users can create their vacancies with the ISP portal,
 > [...]

That's a good idea. But then internal e-mails need to go out to the ISP,
don't they? Because, if internal e-mails get delivered locally, the vacation
autoresponses on the ISP will not trigger, will they?

The trouble is, with that configuration, if the Internet link goes down,
internal e-mail stops working too.

I was hoping that there would be a complete mail server setup guide somewhere
for this kind of setup. But I guess I'll have to piece all these
information snippets together.

Regards,
   rdiez

Hello R,

reply inline below:

Am 25.10.20 um 23:12 schrieb R. Diez:
> 
> 
>> That way your users can create their vacancies with the ISP portal,
>  > [...]
> 
> That's a good idea. But then internal e-mails need to go out to the
ISP,
> don't they? Because, if internal e-mails get delivered locally, the 
> vacation autoresponses on the ISP will not trigger, will they?
> 
> The trouble is, with that configuration, if the Internet link goes down, 
> internal e-mail stops working too.
Hello R, I only wrote about the incoming side - of course, you also want 
to send mail to remote users, and that includes users with an address of 
?@myisp.com. They will go to the ISP and be fetched to local from there.

And if internet's down, e-mail will stop working anyways, so why bother? 
Even facebook/whatsupp will stop working then!

With some tinkering, you can configure your local relay smtp to deliver 
those locally, but if your people do not talk about their vacancies over 
the water cooler, then they will miss that reminder then.
> I was hoping that there would be a complete mail server setup guide 
> somewhere for this kind of setup. But I guess I'll have to piece all 
> these information snippets together.
> 
Sorry, the world is too big :)

-- 
peter

Hello R.,

Sunday, October 25, 2020, 11:12:48 PM, you wrote:

RD> I was hoping that there would be a complete mail server setup
RD> guide somewhere for this kind of setup. But I guess I'll have to
piece all these
RD> information snippets together.

There are plenty of guides available. I don't know your mother tongue,
but seeing your last name, I assume you may be speaking German. Take a
look at these German language guides:

https://www.it-management-kirchberger.at/manuals-tutorials/server-centos-7/postfix-mailserver-vimbadmin/postfix-amavisd-new-clamav-spamassassin.html
https://www.dokuwiki.tachtler.net/doku.php
https://dokuwiki.nausch.org/doku.php/centos:mail_c7:spam_6

I am sure others can provide other language guides as well.

best regards
---
Michael Schumacher
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I have used this person's blog for a few operating systems.

https://blog.andreev.it/?p=1975

Poke around for the correct OS. I only set up dovecot and postfix. Keep it
simple. You then need opendkim. I think opendkim checks the incoming mail. There
is another procedure to sign your mail.

When you think it works, use
https://dkimvalidator.com/

Also go to mxtools to verify you haven't created an open relay.

Regarding LetsEncrypt, I use the bash script.
https://github.com/acmesh-official/acme.sh
This saves you Python headaches. 




? Original Message ?


From: michael.schumacher at pamas.de
Sent: October 26, 2020 1:09 AM
To: rdiezmail-2006 at yahoo.de; pch at myzel.net
Cc: dovecot at dovecot.org
Subject: Re: Looking for a guide to collect all e-mail from the ISP mail server


Hello R.,

Sunday, October 25, 2020, 11:12:48 PM, you wrote:

RD> I was hoping that there would be a complete mail server setup
RD> guide somewhere for this kind of setup. But I guess I'll have to
piece all these
RD> information snippets together.

There are plenty of guides available. I don't know your mother tongue,
but seeing your last name, I assume you may be speaking German. Take a
look at these German language guides:

https://www.it-management-kirchberger.at/manuals-tutorials/server-centos-7/postfix-mailserver-vimbadmin/postfix-amavisd-new-clamav-spamassassin.html
https://www.dokuwiki.tachtler.net/doku.php
https://dokuwiki.nausch.org/doku.php/centos:mail_c7:spam_6

I am sure others can provide other language guides as well.

best regards
---
Michael Schumacher

>>> That way your users can create their vacancies with the ISP portal,
>> But then internal e-mails need to go out to the ISP,
>> don't they? Because, if internal e-mails get delivered locally, the
>> vacation autoresponses on the ISP will not trigger, will they?
> Hello R, I only wrote about the incoming side - of course, you also want to
> send mail to remote users, and that includes users with an address of 
> ?@myisp.com. They will go to the ISP and be fetched to local from there.

That is not what I had in mind. My users will not go to the ISP and fetch their
e-mails from there. They will always go to my internal mail server. If
a user is on the road, he/she will connect with OpenVPN first.

Of course, immediately receiving new e-mails without a VPN connection would be
more comfortable. But that level of comfort needs a real mail server
consultant then. 8-)


 >> The trouble is, with that configuration, if the Internet link goes
down,
 >> internal e-mail stops working too.
> And if internet's down, e-mail will stop working anyways, so why
bother?
> Even facebook/whatsupp will stop working then!

I have seen Microsoft Exchange setups that carried on working locally if the
Internet connection was down. If Microsoft can do that, I want to have it
too. 8-)

Whatsapp (which you shouldn't actually use for confidential business
communications) may continue working with your mobile phone data connection.

> With some tinkering, you can configure your local relay smtp to deliver
those locally,
> but if your people do not talk about their vacancies over the 
> water cooler, then they will miss that reminder then.

People are not that careless even in small businesses, where there is no water
cooler at all. Most of them do set up autoresponders, so that customers
know. Small business tend to care about customers more than big ones. The idea
is that those autoresponders should also work internally.

I just learnt that you can install a "Managesieve server" plug-in for
forwarding and autoresponders. That would be the way to go then, instead of
using the autoresponder at the ISP.


Best regards,
   rdiez

> There are plenty of guides available. I don't know your mother tongue,
> but seeing your last name, I assume you may be speaking German. Take a
> look at these German language guides:
I do speak German, thanks for the links.

>
https://www.it-management-kirchberger.at/manuals-tutorials/server-centos-7/postfix-mailserver-vimbadmin/postfix-amavisd-new-clamav-spamassassin.html
I could not find anything there related to multidrop or "catch all"
mailboxes.

> https://www.dokuwiki.tachtler.net/doku.php
Nothing like that there either.

> https://dokuwiki.nausch.org/doku.php/centos:mail_c7:spam_6
This is a huge document with little introduction. It seems to be mostly about
fighting spam. I did not find anything like the setup I described.

Regards,
   rdiez