fistly many thanks falko and cbj4074. My ip is not blacklisted. Previously server was debian 6 no problem mail send or receive(There was no problem with ports) . After install Ubuntu nginx. After that it was problem.
I want to try these:
I want to change the smtp port.
Squirrelmail smtp port change 587 after SMTP-Server: Offline.
Is there a need to change any other setting?