The attachment variable in notifications is set to NONE when the attachment content is uuencoded. Also, the attachment list in the Message Audit Logs shows "None" in the "Full attachment list" field for messages with uuencoded attachments.
This issue has been addressed in Symantec Messaging Gateway version 9.5.0. Releases prior to version 9.5.0 do not support notification variables on uuencoded message content.
Note: If you use the Microsoft Outlook 2007 e-mail client, make sure the "Encode attachments in UUENCODE format when sending a plain text message" checkbox is unchecked. To see this setting in Outlook 2007: