>The problem was: allow_url_fopen was deactivated

Yup, that would do it.

If allow_url_fopen is disabled Sendy would not work using the API examples Sendy are suggesting – which is of course what I referred to and used when integrating Sendy here.

However, I really cannot see any reason why allow_url_fopen needs to be enabled for this sort of thing so as of v1.5 of the WPPizza Mailinglists plugin allow_url_fopen is not needed anymore if using Sendy .

Hope that helps

Thanks for doing the digging around ….

Cheers

Oliver