[Djigzo users] Signing every outgoing mail

Hello,   I have a problem with signing my mails.   I created an internal user and imported the encryption and the signing certificate (comodo). The Info field of the certificates contains: "Error building certPath. No issuer certificate for certificate in certification path found."   I followed the steps in the manual,   -set Locality to "internal" - set encrypt mode to "allow" - unchecked the "Only sign when encrypt" box   When sending a mail from the specific user to a testuser the mail is not signed.   Does anyone of you know, what the mistake is?   Thank, Markus     Mit freundlichen Grüßen mareco gmbh & co.kg Dipl.-Ing.(FH) Markus Zimmermann Geschäftsführer der Komplementärin   Rothelebuch 7, 87637 Seeg Tel. +49 (8364) 984009-0 Fax. +49 (8364) 984009-9 E-Mail. info(a)mareco.biz Internet. www.mareco.biz   Sitz Seeg, HRA8889 Amtsgericht Kempten   Persönlich haftende Gesellschafterin CRM Verwaltungs-GmbH Sitz Seeg, HRB9745 Amtsgericht Kempten Geschäftsführer Markus Zimmermann