I shifted my 2 WordPress blogs which are over a decade old yesterday to a Ghost droplet on digital ocean.
When I tried to send this article to all my 1300 + subscribers I am getting "failed to send"notification.
I have entered my private API Key and the mailgun server name is correct
Also, I did test email sending to myself and it works, it only fails to send the bulk email.
I have earlier this month shifted my personal blog to Ghost and emails to members are sent without any issues from the same mailgun account. I am using the same API keys for the other blogs too. namely Bandra.info and Powai.info
Do I need to configure different mailgun servers for these two blogs?