Copy me on the e-mail.
请将邮件抄送给我。
Always include my assistant on any e-mail you send me, please.
请将每一封发给我的邮件都抄送给我的助手。
Just copy me on the e-mail so you don't have to send two separate e-mails.
请将文件抄送给我即可,这样您就不用发送两次了。

If you need to contact us, simply reply to this message.
如果您需要联系我们，请直接回复该邮件。
If you need to contact us in the future, simply reply to this message or call our Customer Assistance Center at 1-800-555-1020.
如果您日后需要联系我们，请直接回复该邮件，或者拨打客户 援助中心电话1-800-555-1020。