Dear Sir/Madam,
I beg you could resend the mail which I failed to receive.The date of the mail might be on 5th January,2009,I think.Meanwhile,the address is on the six self-addressed mailing labels.Thanks.
Yours sincere ###
你的翻译太中文化,而且句子太长,不太符合外国人的日常交流习惯.最后那个“地址没错”我觉得多余的,没必要写进去.后面那句我也没怎么看懂,所以照抄了.
上楼的翻译不错的,就是有一点最好把要求对方做的事写在开头,原因放后,这比较符合西方的文化要求.