not receiving mail from zoho users

not receiving mail from zoho users

error coming on our domain :-  connect from sender4-op-o16.zoho.com[136.143.188.16]
Apr 27 15:53:58 ns postfix/smtpd[17864]: connect from unknown[85.208.136.32]
Apr 27 15:53:58 ns postfix/smtpd[16331]: DE88B2803A3: client=sender4-op-o16.zoho.com[136.143.188.16]
Apr 27 15:53:59 ns postfix/smtpd[16331]: lost connection after DATA (1348 bytes) from sender4-op-o16.zoho.com[136.143.188.16]
Apr 27 15:53:59 ns postfix/smtpd[16331]: disconnect from sender4-op-o16.zoho.com[136.143.188.16]

connect from sender-op-o11.zoho.in[103.117.158.11]
May 16 14:00:15 ns postfix/smtpd[2198]: 931F92803B0: client=sender-op-o11.zoho.in[103.117.158.11]
May 16 14:00:15 ns postfix/smtpd[2198]: lost connection after DATA (1365 bytes) from sender-op-o11.zoho.in[103.117.158.11]
May 16 14:00:15 ns postfix/smtpd[2198]: disconnect from sender-op-o11.zoho.in[103.117.158.11]


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