Sample spam with subject Returned Msg: =?UTF-8?B?UmU6IExlZCBEaXNwbGF5IE1hbnVmYWN0dXJlciBTaW5jZSAyMDA1?= (1)

Date From, Subject Body
6 years ago <Antispam@system>
Returned Msg: =?UTF-8?B?UmU6IExlZCBEaXNwbGF5IE1hbnVmYWN0dXJlciBTaW5jZSAyMDA1?= 		The attached message was undeliverable. while talking to [61.42.12.76:25] 550 sorry, your recipient