If you want to use your MTA to route encrypted and/or signed messages through PGP Universal Server, do the following:
1. Ensure your MTA can route based on content.
2. Configure the following filters.
Rule # Condition Attribute Operator Value
1 Attachment Name is *.pgp
2 Attachment Name is *.gpg
3 Attachment Name is *.asc
4 Message Header content-type Contains multipart/encrypted
5 Message Header content-type Contains multipart/signed
6 Message Header content-type Contains application/pkcs7-mime
7 Message Header content-type Contains application/x-pkcs7-mime
8 Message Header content-type Contains application/pkcs7-signature
9 Any part of message Contains -----BEGIN PGP
10 Any part of message Contains -----BEGIN=20PGP
11 Any part of message Contains * PGP
12 Any part of message Contains LS0tLS1CRUdJTiBQR1Ag
13 Any part of message Contains LS0tQkVHSU4gUEdQI
14 Any part of message Contains LS0tLUJFR0lOIFBHUC
3. If an email matches one of the filters, route it through PGP Universal Server to be decrypted and/or verified.
4. If the email does not match any of the above filters, route the message around PGP Universal Server since it will almost certainly not be encrypted or signed.
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