NDR - Exchange - returned '550 5.4.300 Message expired - even if message was received

%3CLINGO-SUB%20id%3D%22lingo-sub-131376%22%20slang%3D%22en-US%22%3ENDR%20-%20Exchange%20-%20returned%20'550%205.4.300%20Message%20expired%20-%20even%20if%20message%20was%20received%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-131376%22%20slang%3D%22en-US%22%3E%3CP%3EGot%20NDR%20-%20Exchange%20-%20returned%20'550%205.4.300%20Message%20expired%20-%20even%20if%20message%20was%20received%20in%20Office%20365.%3C%2FP%3E%0A%3CP%3E%26nbsp%3B%3C%2FP%3E%0A%3CP%3Esender%20is%20google%20and%20yahoo%3C%2FP%3E%0A%3CP%3E%26nbsp%3B%3C%2FP%3E%0A%3CP%3Ewe%20are%20in%20hybrid%20environment%3C%2FP%3E%0A%3CP%3E%26nbsp%3B%3C%2FP%3E%0A%3CP%3Eany%20known%20issue%3F%3C%2FP%3E%0A%3CP%3E%26nbsp%3B%3C%2FP%3E%0A%3CP%3Etnx%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-131376%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EExchange%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EOffice%20365%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-131455%22%20slang%3D%22en-US%22%3ERe%3A%20NDR%20-%20Exchange%20-%20returned%20'550%205.4.300%20Message%20expired%20-%20even%20if%20message%20was%20received%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-131455%22%20slang%3D%22en-US%22%3E%3CP%3EHello%20Marvin%20Oco%2C%3C%2FP%3E%0A%3CP%3E%26nbsp%3B%3C%2FP%3E%0A%3CP%3EI'm%20copying%20this%20solution%20from%20another%20Microsoft%20blog%3A%26nbsp%3B%3C%2FP%3E%0A%3CP%3E%26nbsp%3B%3C%2FP%3E%0A%3CP%3Esource%3A%26nbsp%3B%3CA%20href%3D%22https%3A%2F%2Fanswers.microsoft.com%2Fen-us%2Fmsoffice%2Fforum%2Fmsoffice_outlook-mso_winother-mso_o365b%2F550-54300-message-expired%2F4d0a6242-1234-4abd-af45-dc12216511b2%3Fauth%3D1%22%20target%3D%22_blank%22%20rel%3D%22noopener%20noreferrer%20noopener%20noreferrer%22%3Ehttps%3A%2F%2Fanswers.microsoft.com%2Fen-us%2Fmsoffice%2Fforum%2Fmsoffice_outlook-mso_winother-mso_o365b%2F550-54300-message-expired%2F4d0a6242-1234-4abd-af45-dc12216511b2%3Fauth%3D1%3C%2FA%3E%3C%2FP%3E%0A%3CP%3E%26nbsp%3B%3C%2FP%3E%0A%3CP%3EProblem%20fixed%20after%20searching%20the%20error%20in%20Google.%3C%2FP%3E%0A%3CP%3E1.%20Account%20was%20hacked.%20Probably%20when%20I%20was%20using%20an%20open%20WIFI%20to%20do%20work%20outside%20the%20office.%3C%2FP%3E%0A%3CP%3E2.%20Hacker%20simply%20FORWARDED%20my%20emails%20to%20the%20gmail%20account.%3C%2FP%3E%0A%3CP%3E3.%20Found%20the%20fix%20here.%26nbsp%3B%3CA%20href%3D%22https%3A%2F%2Fcommunity.spiceworks.com%2Ftopic%2F1970153-office-365-strange-non-delivery-report%22%20target%3D%22_blank%22%20rel%3D%22nofollow%20noopener%20noreferrer%20noopener%20noreferrer%22%3Ehttps%3A%2F%2Fcommunity.spiceworks.com%2Ftopic%2F1970153-office-365-strange-non-delivery-report%3C%2FA%3E%3C%2FP%3E%0A%3CP%3E4.%20Microsoft%20description%20of%20the%20fix%20here%20-%26nbsp%3B%3CA%20href%3D%22https%3A%2F%2Fblogs.technet.microsoft.com%2Foffice365security%2Fhow-to-fix-a-compromised-hacked-microsoft-office-365-account%2F%22%20target%3D%22_blank%22%20rel%3D%22noopener%20noreferrer%20noopener%20noreferrer%22%3Ehttps%3A%2F%2Fblogs.technet.microsoft.com%2Foffice365security%2Fhow-to-fix-a-compromised-hacked-microsoft-office-365-account%2F%3C%2FA%3E%3C%2FP%3E%0A%3CP%3E5.%20Logged%20in%20to%20365%20account%20and%20found%20the%20hacker%20had%20entered%20a%20gmail%20account%20and%20selected%20forward%20in%20the%20checkbox.%3C%2FP%3E%0A%3CP%3E6.%20My%20IT%20spec%20says%20it%20will%20take%201%20to%2072%20hours%20to%20fizzle%20out.%3C%2FP%3E%0A%3CP%3E7.%20Waiting%20for%20results%20as%20of%208-11-17.%3C%2FP%3E%0A%3CP%3E%26nbsp%3B%3C%2FP%3E%0A%3CP%3EI%20hope%20that%20can%20help%20you.%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E
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Super Contributor

Got NDR - Exchange - returned '550 5.4.300 Message expired - even if message was received in Office 365.

 

sender is google and yahoo

 

we are in hybrid environment

 

any known issue?

 

tnx

1 Reply
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Hello Marvin Oco,

 

I'm copying this solution from another Microsoft blog: 

 

source: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_winother-mso_o365b/550-54300...

 

Problem fixed after searching the error in Google.

1. Account was hacked. Probably when I was using an open WIFI to do work outside the office.

2. Hacker simply FORWARDED my emails to the gmail account.

3. Found the fix here. https://community.spiceworks.com/topic/1970153-office-365-strange-non-delivery-report

4. Microsoft description of the fix here - https://blogs.technet.microsoft.com/office365security/how-to-fix-a-compromised-hacked-microsoft-offi...

5. Logged in to 365 account and found the hacker had entered a gmail account and selected forward in the checkbox.

6. My IT spec says it will take 1 to 72 hours to fizzle out.

7. Waiting for results as of 8-11-17.

 

I hope that can help you.