看起来像邮件发送问题。因此，我建议您调试并检查导致问题的行。



粘贴所有代码对我们没有帮助。因为我们无法预测问题的界限。如果您将问题范围缩小到几行代码，那么它肯定会帮助我们建议您解决方案。但在此之前，请尝试调试自己并找出原因。

Seems like a mail sending issue. So I suggest you to debug and check the line which is causing the issue.

Pasting all the codes don't help us. Because we can't predict the line of issue. If you narrow down the problem to couple of line of codes, then it would definitely help us suggesting you solutions. But before that, try to debug yourself and find out the cause.