send mail from null client to central server but mail removed

i’m getting stuck with postfix problem. here the problem is : – null client forward the mail to central server. but,central server shows that connect from unknown and lastly this mail is removed
here null client maillog:-

Aug 27 08:59:11 c postfix/pickup[6258]: AD3D510C3ADA: uid=0 from=<root>
Aug 27 08:59:11 c postfix/cleanup[6865]: AD3D510C3ADA: message-id=<20200827025911.AD3D510C3ADA@c.client.local>
Aug 27 08:59:11 c postfix/qmgr[6259]: AD3D510C3ADA: from=<root@client.local>, size=421, nrcpt=1 (queue active)
Aug 27 08:59:11 c postfix/error[6868]: AD3D510C3ADA: to=<smb2@192.68.0.100>, relay=none, delay=0.13, delays=0.09/0.02/0/0.02, dsn=5.1.3, status=bounced (bad address syntax)
Aug 27 08:59:11 c postfix/cleanup[6865]: BFB4F10C4552: message-id=<20200827025911.BFB4F10C4552@c.client.local>
Aug 27 08:59:11 c postfix/qmgr[6259]: BFB4F10C4552: from=<>, size=2121, nrcpt=1 (queue active)
Aug 27 08:59:11 c postfix/bounce[6869]: AD3D510C3ADA: sender non-delivery notification: BFB4F10C4552
Aug 27 08:59:11 c postfix/qmgr[6259]: AD3D510C3ADA: removed
Aug 27 08:59:11 c postfix/smtp[6870]: BFB4F10C4552: to=<root@client.local>, relay=192.168.0.100[192.168.0.100]:25, delay=0.15, delays=0/0.02/0.08/0.05, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as E91E618B06AB)
Aug 27 08:59:11 c postfix/qmgr[6259]: BFB4F10C4552: removed

and central server maillog:-

Aug 27 09:18:44 main postfix/smtpd[4729]: connect from unknown[192.168.0.110]
Aug 27 09:18:44 main postfix/smtpd[4729]: E91E618B06AB: client=unknown[192.168.0.110]
Aug 27 09:18:44 main postfix/cleanup[4732]: E91E618B06AB: message-id=<20200827025911.BFB4F10C4552@c.client.local>
Aug 27 09:18:44 main postfix/qmgr[4202]: E91E618B06AB: from=<>, size=2303, nrcpt=1 (queue active)
Aug 27 09:18:44 main postfix/smtpd[4729]: disconnect from unknown[192.168.0.110]
Aug 27 09:18:44 main postfix/smtp[4733]: E91E618B06AB: to=<root@client.local>, relay=none, delay=0.05, delays=0.02/0.02/0.01/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=client.local type=AAAA: Host not found)
Aug 27 09:18:44 main postfix/qmgr[4202]: E91E618B06AB: removed

.what can i do now??

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Author: tamjidul islam