ualnwe

### Description ### The problem: When using dns diagnostics to check SPF records, a possible loop can occur. If the domain has an SPF record pointing to another domain that...

### Contribution guidelines - [X] I've read the [contribution guidelines](https://github.com/mailcow/mailcow-dockerized/blob/master/CONTRIBUTING.md) and wholeheartedly agree ### I've found a bug and checked that ... - [X] ... I understand that not following...