contoso-com.mail.protection.outlook.com[xxx.xxx.xxx]said:451.4.7.500 server busy. please try again

%3CLINGO-SUB%20id%3D%22lingo-sub-1929609%22%20slang%3D%22en-US%22%3Econtoso-com.mail.protection.outlook.com%5Bxxx.xxx.xxx%5Dsaid%3A451.4.7.500%20server%20busy.%20please%20try%20again%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1929609%22%20slang%3D%22en-US%22%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3Ewe%20have%20users%20that%20sends%20email%20to%20O365%20user%20mailbox%2C%20mail%20sending%20failed%20with%20error%20below%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3Ehost%20contoso-com.mail.protection.outlook.com%5Bxxx.xxx.xxx%5Dsaid%3A451.4.7.500%20server%20busy.%20please%20try%20again%20later%20from%5Bxxx.xxx.xxx.xxx%5D%20(s777230)%5BHK2APC01FT138.EOP-APC05.PROD.PROTECTION.COM%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3Eany%20known%20fix%3F%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-1929609%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EAdmin%3C%2FLINGO-LABEL%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-1929855%22%20slang%3D%22en-US%22%3ERe%3A%20contoso-com.mail.protection.outlook.com%5Bxxx.xxx.xxx%5Dsaid%3A451.4.7.500%20server%20busy.%20please%20try%20aga%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1929855%22%20slang%3D%22en-US%22%3E%3CP%3EBest%20open%20a%20support%20ticket.%3C%2FP%3E%3C%2FLINGO-BODY%3E
Super Contributor

 

we have users that sends email to O365 user mailbox, mail sending failed with error below

 

host contoso-com.mail.protection.outlook.com[xxx.xxx.xxx]said:451.4.7.500 server busy. please try again later from[xxx.xxx.xxx.xxx] (s777230)[HK2APC01FT138.EOP-APC05.PROD.PROTECTION.COM

 

any known fix?

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