求 ：主动联络许久未联系的老客户英文邮件怎么写

This is Christina from xxxxx, checking through our record we note with regret that we have not had the pleasure of an order from you for quite a long time~ as my previous colleague xxxx is not available ,i'll taking her place to service you and in your assistance .i will keep working hard as always and more better !

We have a very strong Stock xxxxxxx. believe can fully satisfy your needs . as you 're our steady customer , i'll effort to give you the most competitive price and superior quality !!

Looking forward to receiving your early reaply,and we can assure you that your requirements will have our very best and prompt attention .

英文邮件格式怎样写？

请勿输入广东话，我听不懂〜

尊敬的XXX：

您好吗？

要求付款的英文邮件怎么写

商业信用证应尽可能礼貌简洁。