Yep, mailgun wont send mails unless you upgrade or have the recipient in your contacts. There are a growing number of threads on this topic, please vote here 
: Are you happy with Mailgun? Poll and thread about emailing in ghost - #3 by rpuls
Yep, mailgun wont send mails unless you upgrade or have the recipient in your contacts. There are a growing number of threads on this topic, please vote here : Are you happy with Mailgun? Poll and thread about emailing in ghost - #3 by rpuls