Microsoft 365
Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line.
3,835 questions
Error: 550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient not found by SMTP address
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(131.20000000000002, 97%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EVS%3C/text%3E%3C/svg%3E)
Venkata Sai Krishna Gummadi
0
Reputation points
Error: 550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient not found by SMTP address lookup we are getting the above error for one of our organization emails When they are sending a verification code from a particular domain, we recently migrated from Google Workspace to Microsoft 365, from then we are facing this issue
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(246.4, 22%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKY%3C/text%3E%3C/svg%3E)
Kael Yao-MSFT 37,496 Reputation points Microsoft Vendor2024-04-01T01:47:34.1533333+00:00 Hi @Venkata Sai Krishna Gummadi,
Is the recipient external or internal?
And since this issue only happens when sending from a particular domain, is this domain verified in Microsoft 365?
If yes, is it an Authoritative domain or internal relay domain?
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