Why are my OpsMgr alert emails sending gibberish for my custom rules?

If you are receiving alerts from Operations Manager where the subject looks something like this: Subject: =?utf-8?BTG95YWx0eSBXZWIgKFNvZigaXMgbm90IHJlc3BvbmRpbmcuIC0gTG95YWx0eVdlYiBMb2dnaW5nIG9uIERMMUdTUFdFQjMxLmdhbWVzdG9wLm… You may be seeing an issue that we ran into. We use custom channels where we define that the email subject includes the name of the alert, content from a custom field, and the name of the entity.…