Mail Server rejecting mail from hotmail/outlook etc addresses.

    Noticed my mail server is rejecting all email from outlook/hotmail etc addresses

    Debian 10

    Latest imscp

    plugins spamassassin, opendkim, openspf, policyweight, letsencrypt, instantssh, cronjobs, phpswitcher, roundcube-plugins, clamav


    Code
    1. Jun 28 11:12:03 gia postfix/policyd-weight[20177]: decided action=550 Mail appeared to be SPAM or forged. Ask your Mail/DNS-Administrator to correct HELO and DNS MX settings or to get removed from DNSBLs; MTA helo: nam10-bn7-obe.outbound.protection.outlook.com, MTA hostname: mail-bn7nam10olkn2079.outbound.protection.outlook.com[40.92.40.79] (helo/hostname mismatch); <client=mail-bn7nam10olkn2079.outbound.protection.outlook.com[40.92.40.79]> <helo=nam10-bn7-obe.outbound.protection.outlook.com> <[email protected]> <[email protected]>; delay: 2s

    Do you have dmarc configured on the server? See the attachment. You have to create an email address where the reports are going to be sent.

    Also see if you have the domain listed in any of the antispam lists. One of the online tools to do that is https://mxtoolbox.com