One of the first things I did on the iPhone was to configure it for my e-mail. I'm still using 4Smartphone for my hosted Exchange account as I mentioned in my "Hosted Exchange 101" post earlier this week. I know that my provider supports IMAP, so I knew that I should be able to get the mail from the Exchange server to the iPhone.
Once I configured it, I ran into a problem: I was able to receive mail, but I was unable to send mail. A few minutes later, I had figured out the minor issue and just in time: this afternoon one of our readers had the same issue. Ken shot me a note indicating that he too uses 4Smartphone for Exchange but he could only receive mail, not send it. I explained these two simple configuration tips:
1. I used the Exchange tab on the iPhone, not the IMAP tab. Ken was using the IMAP tab, which might work but I'm not going to undo my mail settings to find out. ;)
2. Quite often people put their mailbox ID and password on the Incoming server settings, but not on the Outgoing server settings. This was my issue which is easy to resolve and Ken had done the same thing.
Once I passed this info to Ken, he added his credentials for the Outgoing server and he was sending mail without any issue. A common-sense, simple solution that's easy to overlook when quickly configuring your e-mail client.
译文:
iphone手机发不了邮件？试试我的小窍门
我迫不及待地对苹果iphone手机进行email设置。现在我仍然使用4smartphone作为我 Exchange主机邮件服务的帐户（本星期初写的另一篇文章“Exchange主机邮件服务101”中提到过）。我知道我的手机支持IMAP协议，所以我理所应当地认为我的邮件可以通过Exchange服务器转移到我的iphone手机。
然而在我设置好之后，我却遇到了这样一个问题：我可以接受邮件，却无法发送邮件。几分钟后，我解决了这个小问题，因而也及时帮助了下午和我遇到相同问题的用户，肯。他告知我他使用4Smartphone来进行邮件的转移时，同样只能收，不能发。我向他传递了两个简单的设置要点。
1，我在iPhone手机上使用的是支持Exchange协议的标签，而肯使用的标签是支持IMAP协议的，也许同样有效，但是我不会为了验证这一点而去重设我的邮件设置。
2，人们常常把邮箱的帐号和密码在内网邮件服务器中做了设置，却没有相应在外网邮件服务器做设置。这是我的问题所在，解决起来非常简单，而肯也做了和我一样的事。
我把这一信息告知肯，他立刻为外网服务器做了证书认证，并毫无问题地能够发送邮件了。看来，快速设置电子邮件客户程序时，简单常规的解决方法却常常为我们所忽视。
注：
IMAP即INTERNET MESSAGE ACCESS PROTOCOL是由美国华盛顿大学所研发的一种邮件获取协议。它的主要作用是邮件客户端（例如MS Outlook Express)可以通过这种协议从邮件服务器上获取邮件的信息，下载邮件等。它与POP3协议的主要区别是用户可以不用把所有的邮件全部下载，可以通过客户端直接对服务器上的邮件进行操作。