[bug 996603] Enhance send_remo_mail tests.
[bug 996603] Enhance send_remo_mail tests.

abdullah2891/remo,tsmrachel/remo,tsmrachel/remo,johngian/remo,mozilla/remo,johngian/remo,mozilla/remo,chirilo/remo,tsmrachel/remo,akatsoulas/remo,johngian/remo,Mte90/remo,Mte90/remo,Mte90/remo,mozilla/remo,flamingspaz/remo,mozilla/remo,chirilo/remo,johngian/remo,Mte90/remo,chirilo/remo,abdullah2891/remo,abdullah2891/remo,tsmrachel/remo,akatsoulas/remo,flamingspaz/remo,akatsoulas/remo,akatsoulas/remo,chirilo/remo,flamingspaz/remo,abdullah2891/remo,flamingspaz/remo