The attachments are missing in SharePoint document library if it is generated by Symantec as email header contains the Content-Type "multipart/related".

Issue Definition:

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      The attachments of Risk reports Mail generated by Symantec are getting dropped when the SharePoint accepts the incoming emails and saves them to the document libraries where the email header contains the Content-Type "multipart/related".

Root Cause:

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      As per Microsoft, this behavior is by-design behavior of SharePoint for below
      reason:
:      Multipart/Related will have the content of the mail aggregated from multiple parts that need to be displayed TOGETHER ( for instance when sending a web page that needs to be displayed by the mail reader "AS IS" , with pictures and text inline) but in our case, we want to send mails along with attachment. So our purpose does not meets with mail having  multipart\related message header content type and it has to be multipart\mixed or multipart\alternative content type.

Solution:

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1.       According to MS, it is by design and respective product needs to be changed to support SharePoint functionality.

2.       Symantec(Veritas) is already working on it and may see fix for them soon.
http://www.symantec.com/connect/it/idea/mime-format-change-requested-nom-65x    

Workaround:

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1.        Send the email to an personal email and have them create a rule to auto forward to SharePoint library.

2.        Create a special email account that emulates work around #1.