Exchange 2010 阻止 Twitter

Question

我负责一个装有 Exchange 2010 服务器的 Windows 网络。看来我们已经有一段时间没有收到 Twitter 邮件了，甚至可能早在万圣节/十一月之前。有人知道如何正确地将 Twitter 列入白名单或检查直接退回的邮件吗？以下是 PowerShell 中的标记部分（这不起作用）：

[PS] C:\Windows\system32>Get-ContentFilterConfig

Name                                  : ContentFilterConfig
RejectionResponse                     : Message rejected as spam by Content Filtering.
OutlookEmailPostmarkValidationEnabled : True
BypassedRecipients                    : {}
QuarantineMailbox                     :
SCLRejectThreshold                    : 7
SCLRejectEnabled                      : False
SCLDeleteThreshold                    : 9
SCLDeleteEnabled                      : False
SCLQuarantineThreshold                : 9
SCLQuarantineEnabled                  : False
BypassedSenders                       : {}
BypassedSenderDomains                 : {twitter.com}
Enabled                               : True
ExternalMailEnabled                   : True
InternalMailEnabled                   : False
ExchangeVersion                       : 0.1 (8.0.535.0)
Identity                              : ContentFilterConfig
ObjectCategory                        : private.local/Configuration/Schema/ms-Exch-Message-Hygiene-Content-Filter-Config
ObjectClass                           : {top, msExchAgent, msExchMessageHygieneContentFilterConfig}
WhenChanged                           : 1/8/2014 8:53:15 AM
WhenCreated                           : 9/27/2011 8:48:45 PM
WhenChangedUTC                        : 1/8/2014 1:53:15 PM
WhenCreatedUTC                        : 9/28/2011 12:48:45 AM
IsValid                               : True