英文邮件的开头和结尾怎么写啊?!

比较同意一问啥不知的回答...
外国人写邮件一般都还蛮随便的..特别是比较熟的朋友啦..
开头可以:
Hey, what's up?
How have you been?
How are you doing recently?
I am so happy to get your email..

etc.,

结尾也可以随便点, 如果是很熟的朋友可以用
XXOO(意思是kiss and hug)
我跟我朋友写邮件后面都是一大排XXXXXXXXXXXXOOOOOOOOOOOOOOO

如果收信人不确定，可以写to
whom
it
may
concern,
结尾最常用的是best
regards或者thank
you
for
your
time，两个同时用也可。
落款用yours
sincerely,
xxx

How are you doing this summer?
I have been thinking about writing to u for a long time ,but....
It's always a great pleasure for me to read your email...

Take care!
Have fun!
Regards.
越写就越随便，不用按这些套路。。。

I am happy to see the letter from you / your best friend
见到我的来信开心吧/ 你最好的朋友

开头可以继续上回信件里面话题，犹如对话一般，无须另起。而结为一般就是best regards, yours truly等等就足够了，不会有人太在意的。