Need to add support for setting SPC EU endpoint to the sendMessage methods. Here is one workaround provided: https://gist.github.com/AledLewis/740968ff68e3b5351a6892af79a97819 Slack Conversation: * [here](https://sparkpost-community.slack.com/archives/C0P1SJDRV/p1522263797000023) and * [here #java](https://sparkpost-community.slack.com/archives/C58R22QNA/p1522265212000587)