problem with sending an local email

[jgto]

I have a special mail, when i'm forwarding a mail does not reach the mailbox in the same server, ie the picture is as follows, when I answer a "particular mail", this never reaches in the local recipient but if reaches one of the street, I'm looking in the maillog and says status: send in the both the local and external mail.
Do you have anything idea?
maybe do you need anything else?
tnks.

[uxbod]

Does the target mailbox have any filters assigned ? Please post the information from /var/log/zimbra.log when the email is sent.