We are not receiving incoming messages from clients who specifically - Microsoft Community


able send mail , receive internal mail, not getting emails addressed clients , outside company.

hi connie,

according description, can receive emails external. firstly suggest check if have add required dns recording domain @ dns hosting provider mx record. here required dns office 365 exchange online:

note: mx domain-com.mail.protection.outlook.com

check external senders if have received ndr (non-delivery report) when sending emails you. can use test external email address send email office 365 account test this. if so, please send entire ndr in private message further research. 

regards,
yang



Office / Outlook / Other/unknown / Office 365 for business



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