If the sender is unable to fix the problem by modifying their message, then it's likely a problem that only the recipient's email admin can fix. These errors often indicate the message violates a security or policy setting configured on the recipient's email servers. The error reported by the receiving server wasn't specific enough to determine the exact nature of the problem. More Info for Email Admins Status code: 550 5.0.350 Was this helpful? Send feedback to Microsoft. Give them the "Reported Error" from the "Error Details" section below.
Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin about the problem. If you're not able to fix the problem, it's likely that only the recipient's email admin can fix it. For example, if the error states that the message was blocked due to a potential virus or because the message was too large, try sending the message again without attachments. The error might tell you what went wrong and how to fix it. How to Fix ItĬheck the "Reported Error" from the "Error Details" section shown below for more information about the problem. When Office 365 tried to send your message, the receiving email server outside Office 365 reported an error.
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