Well.. When I send e-mail to @hsbc.com.br, My zimbra return:
De: Mail Delivery System [mailto:MAILER-DAEMON@mail.mydomain.com.br]
Enviada em: sexta-feira, 1 de julho de 2011 14:35
Assunto: Undelivered Mail Returned to Sender
This is the mail system at host mail.mydomain.com.br.
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system
<firstname.lastname@example.org>: host mail-in.hsbc.com.br[18.104.22.168]
554 Transaction Failed Spam Message not queued. (in reply to end of DATA
Why does this happen?
And, how can I fix this?