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MailPlus Common Issues, LOG : MailPlus: /var/log/mailplus_err.log …

- - - - Info Collect：
        [1] Can't send to which user account
        [2] Any error message or returned email
        Check：
        [1] Check if any related messages in maillog
        [2] Make sure permission settings are correct
        [3] Check if the user enabled in MailPlus Server > Account
        [4] Check if the user added into a domain under MailPlus Server > Domain
    - - Info Collect：
        [1] Any error message or returned email
        Check：
        [1] Check if any related messages in maillog
        [2] port 25 opened?
        [3] port 25 can go outside?
        [4] Check if the nodes are abnormal via
        traceroute -p 25 -T mail.synology.com
        Reference ticket please refer to HERE.
        [5] Check SMTP settings in MailPlus Client. If it's empty, check if the user added into a domain under MailPlus Server > Domain
    - - Info Collect：
        [1] Can't send to which domain/email address
        [2] Any error message or returned email
        [3] Check maillog
        Common scenario：
        KeyWord: The IP you're using to send mail is not authorized 550-5.7.1 to send email directly to our servers
        Solution: Ask user to refer to Google's article and setup SPF/DKIM/DMARC records.
        Reference ticket please refer to HERE.