@pitaj Thanks a lot : that really makes much more sense now. I allready had deployed mailgun as a service through the use of an API key and that's what i was looking for ! Now that my domain has been created in the mailgun admin pannel and verified through the propagation of specific DNS records, i can confirm that the SMTP credentials are working and that the mails are being sent ! These clarifications were very helpful indeed !

Thanks for answering this with such speed @Kowlin @pichalite