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Your message couldn't be delivered because the recipient's email server (outside Office 365) suspect
Hi, issue has lasted for months already. First i thought issue was on gmail side (when i tried to reply to emails which were sent from @gmail.com) , but now i discovered that i can`t reply to 90%...
Hello Raginho
Please confirm if you are experiencing this issue when you send email from OWA (Outlook.office.com) or outlook desktop client or both.
Also confirm if you have SPF,DKIM and DMARC set up for your domain.
Use the Microsoft header analyzer below to check the message header of the email, to see the spam confidence level (SCL), I suspect that your outbound emails might be leaving through the High risk delivery pool
https://mha.azurewebsites.net/
Please confirm if you are experiencing this issue when you send email from OWA (Outlook.office.com) or outlook desktop client or both.
Also confirm if you have SPF,DKIM and DMARC set up for your domain.
Use the Microsoft header analyzer below to check the message header of the email, to see the spam confidence level (SCL), I suspect that your outbound emails might be leaving through the High risk delivery pool
https://mha.azurewebsites.net/