PHP mail（）头附件第一行接收为空（文件已损坏）

目前正在将网站从PHP5.2移动到PHP5.6Web服务器

发送的标题：

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hotmail中收到的邮件头：

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Return-Path: *********
X-OriginalArrivalTime: 26 Nov 2015 12:41:08.0908 (UTC) FILETIME=[B96B96C0:01D12847]

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行“IVBORW0KGGOAAAANSUHEUGAAABQAAAICAMAAABODAMPAAABYFBMVEUAAACDPTEDPTETEHQDQIQDH”缺失，无法找出原因。如果附件只有一个base64行，则该行将被删除，文件将作为空白接收

在移动到新服务器之前，代码在文件头和base64内容之间有换行符，但PHP5.6新的安全更新要求文件头不能包含任何空行（）