SES在电子邮件正文中发送base64字符（而不是html）[基本情况]

Question

我遇到html发送vis aws-ses的问题。每隔一段时间它就会在电子邮件正文中发送base64文本。我能够捕获一个有这个问题的html并且无法弄清楚问题 - 希望其他人对如何修复它有任何想法。

我甚至创建了一个测试用例来重现这个问题。 测试用例链接：https://drive.google.com/file/d/1LWrnQowI4yLr1nYOSzcCF7_gH1sJ9_ht/view?usp=sharing

我正在使用java sdk通过SES发送电子邮件并将HTML传输到ses服务器，但它在电子邮件正文中发送base64字符，如下所示：

=？UTF-8 2 B 4 PCEtLVtpZiBndGUgbXNvIDldPjx4bWw + CiAgICAgPG86T2Zm？= =？UTF-8 2 B 4 aWNlRG9jdW1lbnRTZXR0aW5ncz4KICAgICAgPG86QWxsb3dQT​​g ==？= =？UTF-8 2 B 4 + RY8 + CiAgICAgIDxvOlBpeGVsc1BlckluY2g OTY8L286UGl4？= =？UTF-8？ B'== ZWxzUGVySW5jaD4KICAgICA8L286T2ZmaWNlRG9jdW1lbnRTZQ？= =？UTF-8 2 B 4 dHRpbmdzPgogICAgPC94bWw + PCFbZW5kaWZdLS0 + CjxodG1s？= =？UTF-8 2 B 4 PgogPGhlYWQ + IAogIDxtZXRhIGh0dHAtZXF1aXY9IkNvbnRlbg ==？= =？UTF-8 2 B 4 dC1UeXBlIiBjb250ZW50PSJ0ZXh0L2h0bWw7IGNoYXJzZXQ9？= =？ UTF-8 2 B 4 dXRmLTgiIC8 + IAogIDxtZXRhIG5hbWU9InZpZXdwb3J0IiBjbw ==？= =？UTF-8 2 B 4 bnRlbnQ9IndpZHRoPWRldmljZS13aWR0aCIgLz4gCiAgPCEt？= =？UTF-8 2 B 4 LVtpZiAhbXNvXT48IS0tPiAKICA8bWV0YSBodHRwLWVxdWl2PQ ==？= =？UTF-8 2 B 4 IlgtVUEtQ29tcGF0aWJsZSIgY29udGVudD0iSUU9ZWRnZSIg？= =？ UTF-8 2 B 4 Lz4gCiAgPCEtLTwhW2VuZGlmXS0tPiAKICA8dGl0bGU + PC90aQ ==？= =？UTF-8 2 B 4 dGxlPiAKICA8c3R5bGUgaWQ9Im1lZGlhLXF1ZXJ5IiB0eXBl？= =？UTF-8 2 B 4 PSJ0ZXh0L2NzcyI + Ym9keSB7CiAgbWFyZ2luOiAwOwogIHBhZA ==？= =？UTF-8 2 B 4 ZGluZzogMDsgfQoKdGFibGUsIHRyLCB0ZCB7CiAgdmVydGljYQ == ？= =？UTF-8？B？