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pramod1 asked
Last Modified: 2018-04-04

I am getting below error.

Subject: Undeliverable: xxxx

The original message was received at Mon, 2 Apr 2018 19:15:53 GMT from m0121180.xxx[]

   ----- The following addresses had permanent fatal errors ----- <imdoamininframanagement@domain.com>
    (reason: 550 5.1.1 User unknown)

   ----- Transcript of session follows ----- ... while talking to [216.x.x.x]:
>>> DATA
<<< 550 5.1.1 User unknown
550 5.1.1 <imdomaininframanagement@domain.com>... User unknown <<< 503 5.5.2 Need rcpt command

isit due to restriction for large DLs.  
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