But, yes, both internal and external domains need to use netcup's DNS

Some advice: if you want to order a Webhosting plan today but the two domains that you want to add aren't yet at netcup, then don't yet add any (internal) domains to the plan at the time of ordering:

He can transfer them as included domains (without paying for the transfer) and they will renew normally with the hosting plan as included “internal” domains. Only problem I found with external domains

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If I'm not mistaken, you'll first need to transfer the two .ch domains to netcup, for which you'll need to pay the current domain-transfer price

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want to transfer 2 .ch domains (=14,28€/year) and use webhostng 4000 only for email...

Good value for the included domains and storage space. They use modified and very restricted plesk, and it is very buggy. And with netcup support even contacting them in German are not helpful.

I've bought cheap and never had any problems. Then again, I buy cheap from reliable hosters, not "new" ones with weird names, which I've never heard of before.

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At Host4Fun/H4F.NET we offer cheap and budget web hosting and VPS services.

https://nixsanctuary.com/prq-former-wikileaks-pirate-bay-host-battles-iis-swedens-se-nu-registry-free-st-domains-for-paying-users/

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You gotta be kidding. Exchange the Cheap with Low Speed and you met that Pricing.

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iperf with 2x cheap vps's below 1€, easily hit 500Mbit.

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