MAIL: Can sign, encrypt but not decrpyt

After Mail was driving me crazy with weird error mesages, I deleted all my certificates and got the replaced by Versisign.
I imported then and since then I can sign and encrypt mails from both of my accounts like charm.
problem is: I can't decrypt a message.
I doublechecked the used certificate with the sender and serialnumber and fingerprint are ok. He deleted all my certificates form his keyring and I send him a signed message again which cause the (correct) certificate to be imported in Keyring. But when he sends me a encrypted message I can't decrypt it.
Mail is just saying "Can't do" in that yellow bar and informs me that I might haven't got the right certificate in my keyring.
This is driving me crazy ...
Anyone with some ideas?

OK, Keychain Access has three Keychains, two of which appear identical right down to Date Modified for each password) and a third called X509 Anchors.
Within each of the two apparently identical Keychains is a single POP3 password for my ISP with my email account number in the info box at the top (when I view the other two users's accounts in Mail preferences, their account numbers are the same as this but suffixed by _2 and _3. But, as I say, the only POP password appearing in Keychain Access is mine. Do you mean I should delete it?

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