Few days ago I install DKIM Signing using on my CentOs 6 server. Yesterday All websites scripts unexpectedly stopped sending out mail.
At /var/log/maillog I look:
Aug 10 00:26:45 lcnoju8613 postfix/cleanup[3326]: A907541324: milter-reject: END-OF-MESSAGE from localhost[127.0.0.1]: 4.7.1 Service unavailable - try again later; from= to=
What is it? How can I fix it?