Problem with characters in subject

Hi,

We're trying to integrate SDP with our customer helpdesk system.
Their system need to receieve the e-mails with ID between characters >> <<, for example:

Res: request reply >>43294<<

My problem is that when I reply a request from SDP with >> and << in subject, the e-mail is sent without subject, even when checking in a regular e-mail client.

I sent an email with this subject:
"Re: [Request ID :##45989##] - [0800net] Notificação de abertura do chamado >>5292135<< Teste"

In my mailbox, the subject is just "Teste". It means that all string before << is ignored.

Is that a way to fix that?

Regards,

Raphael Freitas