1211: Split HOST_ANTISPAM in HOST_ANTISPAM_MILTER and HOST_ANTISPAM_WEBUI r=mergify[bot] a=micw
## What type of PR?
bug-fix
## What does this PR do?
Fixes#1190 by separating HOST_ANTISPAM into HOST_ANTISPAM_MILTER and HOST_ANTISPAM_WEBUI
### Related issue(s)
- closes#1190
- closes#1150
## Prerequistes
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.
- [ ] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file.
Co-authored-by: Michael Wyraz <michael@wyraz.de>
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