获得Outlook VSTO解决方案的发件人证书的错误
在使用Outlook VSTO解决方案工作时，面对获得电子邮件发送者证书（PR_USER_X509_CERTIFICATE）的问题，当PR_ADDRTYPE_W为SMTP时，而如果EX IE Exchange则不给以下代码提供任何例外。
这是我的C＃示例代码要获取用户证书
NameSpace mapiNamespace = mailItem.Application.GetNamespace("MAPI");
Recipient emailSender = mapiNamespace.CreateRecipient(mailItem.SenderEmailAddress);
emailSender.Resolve();
object[] senderCertificateInfo = emailSender.PropertyAccessor.GetProperty("http://schemas.microsoft.com/mapi/proptag/0x3A701102");
，我已经通过OutlookSpy分析了两种类型的电子邮件的差异。根据我的发现，对于Exchange，对于很多其他属性也可以使用PR_USER_X509_CERTIFIFICATE，但对于SMTP，与Exchange电子邮件相比，很少有属性可用。
有人可以帮助我在所有情况下获得发件人证书吗？
谢谢
While working on Outlook VSTO solution, facing an issue for getting email sender's certificate (PR_USER_X509_CERTIFICATE) when PR_ADDRTYPE_W is SMTP whereas in case of EX i.e. EXCHANGE no exception thrown for below code.
Here is my sample code of C# to get user certificate
NameSpace mapiNamespace = mailItem.Application.GetNamespace("MAPI");
Recipient emailSender = mapiNamespace.CreateRecipient(mailItem.SenderEmailAddress);
emailSender.Resolve();
object[] senderCertificateInfo = emailSender.PropertyAccessor.GetProperty("http://schemas.microsoft.com/mapi/proptag/0x3A701102");
I have analyzed the difference of both types of emails via OutlookSpy. As per my findings, for EXCHANGE lot of additional properties are also available with PR_USER_X509_CERTIFICATE but for SMTP, a very few properties available as compare of EXCHANGE emails.
Can someone assist me to get sender certificate for all cases?
Thanks
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除非证书与消息一起发送，否则没有位置可以在一次性SMTP地址中从Outlook中获取证书。
对于“ EX”类型发件人，证书存储在GAL中，您可以在其中阅读。没有SMTP地址的全球中央存储库。最好的方法是检查是否有本地联系人，其中可能存储证书的匹配SMTP地址，但是您是需要将该证书添加到该联系人的人。
Unless the certificate was somehow sent along with the message, there is no place for Outlook to pull a certificate from in case of an one-off SMTP address.
In case of "EX" type senders, the certificate is stored in GAL, where you can read it from. There is no central world-wide repository of SMTP addresses. The best you can do is check if you have a local contact with a matching SMTP address that might have a certificate stored, but you are the one who would need to add that certificate to that contact to begin with.