Thanks to Vadim and others for their posts to me - I appreciate it. You folks have confirmed the command I am using - SMIME. By the way Vadim - It may qualify as a SET message but I don't think it is meant to be a SET message. Also: I apologize for not including the error messages in my last post: end-of -the-day brain fade I guess.
Here are those error messages: Error reading S/MIME message 23126:error:0D07207B:asn1 encoding routines:ASN1_get_object:header too long:asn1_lib.c:138: 23126:error:21078082:PKCS7 routines:B64_READ_PKCS7:decode error:pk7_mime.c:142: 23126:error:2107A08B:PKCS7 routines:SMIME_read_PKCS7:pkcs7 parse error:pk7_mime.c:299: There appears to be nothing wrong with the headers that I can just eyeball(again, the headers are after my signature - I included a few more that I excluded the last time because of identifying information - I just 'X'-ed that out this time), but the structure of the file is unusual compared to our other trading partners - it isn't a multipart file. It is just simple single part message . The file is signed with the trading partner's certificate, which I have as well. Here is the command I am using: [EMAIL PROTECTED] openssl smime -decrypt -recip MYCERT.pem -signer THEIRCERT.pem -in posteddata.dat -out clear.txt Spencer Yost ===========BEGIN HEADERS ============== Connection: close Content-Disposition: attachment; filename=smime.p7m Content-Length: 4241 Content-Transfer-Encoding: binary Content-Type: application/pkcs7-mime; smime-type=enveloped-data; name=smime.p7m Date: Wed, 10 Sep 2003 24:42:16 GMT Disposition-Notification-Options: signed-receipt-protocol=optional, pkcs7-signature; signed-receipt-micalg=optional, sha1 Disposition-Notification-To: XXXXXXXXXXXXXXXXXXXX From: [EMAIL PROTECTED] Host: XXXXXXXXXXXXXXXXX Message-ID: <[EMAIL PROTECTED]> Mime-Version: 1.0 Receipt-Delivery-Option: XXXXXXXXXXXXXXXXXXX Recipient-Address: XXXXXXXXXXXXXXXXXXXXXXXXXX Subject: 123369107237393;140034485600000E Size to read: 4241 ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]