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I server can send mail to gmail, yahoo, but not outlook and hotmail, why?
I am new at linux, I build my mail service in CentOS using postfix, dovecot and squirrelmail, I can send email to gmail, and yahoo, although some of them are in spam, but my outlook, and hotmail cannot receive any mail. Also, my service cannot receive any mail, even from myself, anyone can teach me ?
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