Keep thepunctuations and smiley faces to a minimum: When you don't know someone, it's a bit odd to add five exclamation marks at the end of the sentence and say things like "thank you a million times!"Being overenthusiastic can also come off as being insincere.

尽量少用标点和表情：当你还不了解他人时，在发完想说的话后加上五个感叹号或者说“千言万语也表达不了我的感谢啊亲！”是很奇怪的。过分热情会让别人觉得不真诚。