请帮我检查下~看英语通顺吗?

.不顺.太不顺了.给楼主改了改.
I am very sorry.
If you are unsatisfied,you may return the goods.However,you should provide the complete postage.Please note that I will not be able to refund your money immediately because at present,I have not yet received the cash; I have only received the bank draft.I will possibly receive the money in about 40 days.I apologize sincerely for your forgiveness.Is it possible to give you the refind after I receive the money?
Wish you good luck.
Best Regards,
署名
其中最后一句“Whether can after I receive the money the part refunds money for you?” 咱不敢肯定是否明白了楼主的意思 是想说“能否在我收到钱之后再退款给您呢?” 如果是就没问题了 不是的话咱上面最后一句得改改
另外书信的习惯是在最后祝福语后加逗号 然后署名.