Can't send e-mail's from a local domain

Hello, i have a installed domain in cwp, i can receive e-mail's but i can't send.

The log says:

May  6 15:08:07 ecoar-contacto postfix/smtpd[24530]: 0D821280A8F: client=89-181-127-21.net.novis.pt[89.181.127.21], sasl_method=LOGIN, sasl_username=test@domain.com
May  6 15:08:07 servidor postfix/cleanup[13985]: 0D821280A8F: message-id=<>
May  6 15:08:07 servidor postfix/cleanup[13985]: 0D821280A8F: milter-reject: END-OF-MESSAGE from 89-181-127-21.net.novis.pt[89.181.127.21]: 4.7.1 Service unavailable - try again later; from=<test@domain.com> to=<test@domain.com> proto=ESMTP helo=<SRV1>

Anyone know this issue?

Regards,

temporary error ?

all your emails getting this error message ?

No, i only have issues with this domain. all other domains work's.

This error appear in all mailbox associated a domain name.

ask the domain admin to white-list your IP

I am domain admin, how i add this domain to white-list?

Thanks,

you can find tutorial on google how to white-list ip in postfix

if only happen in one domain, try to rebuild your postfix.
dont forget to backup main.cf and master.cf if you ever make any custom configuration..

Btw, what do you mean with "local domain", is that real public domain or ?

I have rebuilded postfix, and the error's still.

It's a local domain, and a real domain.

I have added a white-list, and can't send the e-mails.

I can receive, from all domain, but i can't send. I think is problem in smtp.

I have checked mysql DB for check if host is inserted in table, it's all OK.

Thanks,

I have found the problem.

If i comment this option in main.cf:
smtpd_milters = inet:127.0.0.1:8891

Now i can send e-mails, but i think is sended without dkim signature.

Anyone know how to fix that?

I have verified SPF and DKIM records, it's all ok.