Desktop Email Encryption

Every time someone send me an email I get that message.

All keys are signed and trusted.

It's a problem with my key?

I get this in PGP log:

16:01:05 Email     Info    Processing message from <(null)> with subject: Problemas com o PGP
16:01:05 Email     Info       Decrypting AES256-encrypted message with key 'XX Xxxxxxx  <xxxxxx@xxxxxx.com>' (0x2D8861B7:0xFC6BC2FF)
16:01:05 Email     Info       Verifying signature made by Zzzzzzz Zzzzzz <zzzzzz@zzzzzzzz.com> (0x2FA0C767) at 12:13:55 15/06/2016
16:01:05 Email     Info          Good Signature from Unmatched Key using SHA-2-256 hash algorithm
16:01:05 Email     Info          Address on signing key does not match sender, signature may not be valid

Why I have <(null)> instead of the email of the person that sent me that message?

There is several other account in the same server/domain and none have this problem.

Thank you.

What the log/anotation tells you is that the "Address on signing key does not match sender".

So the sender (the SMTP emaill address in the FROM field in the email headers) is not the same as the SMTP email address associated with the key that signed the message, in your case: Zzzzzzz Zzzzzz <zzzzzz@zzzzzzzz.com> (0x2FA0C767).

Maybe something modifies the message before it arrives to your inbox?