I have email archive setup and importing pdf attachments from emails into Laserfiche.  During import I pass the senders email address into a template field for workflow to utilize.  I have a couple of emails where the archive imports the pdf, but it unable to populate template fields with any information from the email (sender, sender address, subject, etc.).  I have looked at the header file of the email and I don't see anything that appears strange.  The email is coming from a vendor that uses some service called "billtrust.com" for sending invoices.  The import works great on 99% of the emails coming in.