Returned mail: see transcript for details

[Mail Delivery Subsystem]

The original message was received at Thu, 10 Jun 2021 14:21:53 +0800
from 42-106-185-252.live.vodafone.in [42.106.185.252] (may be forged)

   ----- The following addresses had permanent fatal errors -----
<kzecoupon at ocac.net>
    (reason: 553 5.3.5 system config error)

   ----- Transcript of session follows -----
554 5.0.0 MX list for ocac.net. points back to edm.ocac.net
553 5.3.5 ocac.net. config error: mail loops back to me (MX problem?)
554 5.3.5 Local configuration error
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