I also always thought that we had to keep both versions active! :)))) well, good to know… one plugin less
The FluentSMTP plugin depends on wp_mail pluggable function and plugin is not able to extend it. Please check if another plugin is using this and disable it for Fluent Mail to work!
restored the 5.6.0 version and the error disappeared
Same problem with FluentSMTP… now I have to find the 5.6.0…
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