SMTP Relay Solution Via Provider

ThomasB

Hello,
Not sure if this is the best place to post this issue…but I’ll try:

In the context of kopano installations, I have read about
“SMTP Relay Solutions via Provider”
There are great posts from Andreas about that.

Before I am going to install a Kopano server for my big family, I would like to understand a few things.

So far, I see the these steps required:

create Kopano User
E-Mail-Alias(es), zB tochter@wir.com or nichte@wir.com, eintragen
‚Request mail from external server’ has to be activated -> receive mails via POP3 (e.g. from GMail-Account: sohn@gmail.com)

so far, so good…

The domain “wir.com” is hosted at myISP, where I am getting the SMTP access credentials from, before adding them to the postfix smtp_auth file.

Now some questions:

Is it possible to add further smtp accounts, also of other domains?
So, do I need to do these smtp_auth entries for ALL users using other domains (uns.com, gmail.com,…)?
What exactly has changed after restarting the postfix module with the newly configured amtp_auth file?
Does it have any infulence on how the sender email address appears for the recipient?
Does it mean that sending emails out of Kopano as tochter@wir.com or sohn@gmail.com, always appear at the recipient with the sender address “MeinName@wir.com”?

I hope I could explain my questions well enough…
I am aware of the spam-topic, so a professionally hosted ISP mail server (blacklists, SPF, etc) are certainly a good choice in such a setup.

Thanks,
Thomas

AnotherAndy

Hi Thomas,
what are you planning in general?
Will the Kopano server be at your home or on a virtual machine at the internet?
As far as I understand - the MX should point to your provider and kopano server will collect mails from several other accounts?
Which post from Andreas did you mean?
Best regards

ThomasB

Hello Merlin,

I was referring to this article:
https://www.univention.de/2016/08/einmal-kopano-to-go-bitte/
where Andreas is partly pointing out how to make use of an SMTP relay, so I asked here for more details.

Kopano will run on my own physical server.
The users (partly) already have their email addresses, which I would like to use for their Kopano accounts (actually, they do not want to change their existing email accounts), as pointed out in the exampes above.

Thanks,
Thomas

AnotherAndy

Hi @ThomasB ,
do you have experience with Linux and postfix?
Looks like with postfix it’s possible:
https://serverfault.com/questions/277651/how-can-i-get-postfix-to-send-mail-to-different-relay-hosts
http://www.postfix.org/SASL_README.html#client_sasl_sender
If your server is at home, ensure you have at least VDSL connection and a dyndns Service.

best regards
Merlin