Hi, Herbert

You'll want to look at SMTP Accounts and Email Retrieval in your Connectivity settings as a user. Here you can set up POP/IMAP "retrieval" of email from another provider, then set up an SMTP account to use for sending messages. Here's the Help page that discusses your Connectivity options:

https://help.smartertools.com/SmarterMail/Current/Topics/User/Settings/MySettings/ConnectedServices

Hi Derek, what a quick answer!

Will test this the next day(s).

If there are further questions, can I ask here again?

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Edit: 

Oh just realized, this is to be done when you are logged in as a user. Always searched in the admin page.

If I have the same provider for outgoing mails for all local users: Do I have to set up a smtp-account for every user? 

Hi, Herbert

Yeah, you'll need to do it for every user because every user can have different settings. (Even if, in your case, they don't.) 

And what is the better strategy? Using for every user his own account for smtp, or using for all users the same?

Perhaps to avoid unnecessary traffic?

Herbert,

I can't say what the better tactic is, but if you're going to use the same SMTP account for each user, you could consider setting the SMTP service as an Outbound Gateway for the domain. You can create it at Settings > Gateways, and enable it for the domain at Domain > Options > Outbound Gateways. If you enter the auth credentials when setting up the gateway, then each user on your server will authenticate with those credentials when sending through the gateway. 

I second Jorel's suggestion. If you can use the gateway configuration, it also simplifies things for the users. When using SMTP Accounts for each user, it would only really work when using the web mail interface, and the users would need to choose to send from the SMTP account for each message. Using the Gateway, it would work whether the users are sending from the web interface or from a client, and it would be seamless to the users.

pop-retrieval makes me problems.

I setup a new user, logged in as the user, entered the connectivity and the the tab with pop/imap-account.

There I created an account (other) with all the infos i got from the provider.

But pressing the save-button, the the bar flashes from left to right  and not even more reaction over minutes.
I double checked the account data. Looking good. Out of good ideas now

BTW: I disabled the firewall on the computer.

EDIT:

OK. provider needed more time to update password. Now working. But still the question for debug infos...