550 5.1.1 <Recipient emailaddress> User unknown; rejecting
Posted: 2016-04-20 03:15
Recently I have changed my hmail server from dynamic to Static (Clean IP). I have right rDNS which points to mail.intensifytech.com.
But I am still getting 550 5.1.1 errors for when I am sending to Distribution list about 100 people. I know the recipient user exists on server. What could be wrong? Anything hmailserver configuration issues?

SMTP Logs
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IP Ranges
----------
Local 192.168.1.65 to 192.168.1.254 Priority 20 <-- This my router local network for ip.
Localhost 76.213.79.2 to 76.213.79.2 P 19
MyComputer 127.0.0.1 to 127.0.0.1 P 15
Internet 0.0.0.0 to 255.255.255.255 P10
all are SMTP authenticated and No external to external.
Please tell me how to resolve this issue?
But I am still getting 550 5.1.1 errors for when I am sending to Distribution list about 100 people. I know the recipient user exists on server. What could be wrong? Anything hmailserver configuration issues?

SMTP Logs
-----------
Code: Select all
"SMTPC" 5612 68294 "2016-04-19 19:08:09.464" "72.54.39.148" "RECEIVED: 220 mail.adso.com ESMTP IceWarp 10.4.5; Wed, 20 Apr 2016 05:38:16 +0530"
"SMTPC" 5612 68294 "2016-04-19 19:08:09.464" "72.54.39.148" "SENT: EHLO mail.intensifytech.com"
"SMTPC" 5612 68294 "2016-04-19 19:08:09.495" "72.54.39.148" "RECEIVED: 250-mail.adso.com Hello mail.intensifytech.com [76.213.79.2], pleased to meet you.[nl]250-ENHANCEDSTATUSCODES[nl]250-SIZE[nl]250-EXPN[nl]250-ETRN[nl]250-ATRN[nl]250-DSN[nl]250-CHECKPOINT[nl]250-8BITMIME[nl]250-AUTH PLAIN LOGIN DIGEST-MD5 CRAM-MD5 GSSAPI[nl]250-STARTTLS[nl]250 HELP"
"SMTPC" 5612 68294 "2016-04-19 19:08:09.495" "72.54.39.148" "SENT: STARTTLS"
"SMTPC" 5612 68294 "2016-04-19 19:08:09.526" "72.54.39.148" "RECEIVED: 220 2.0.0 Ready to start TLS"
"SMTPC" 5612 68294 "2016-04-19 19:08:09.620" "72.54.39.148" "SENT: EHLO mail.intensifytech.com"
"SMTPC" 5680 68294 "2016-04-19 19:08:09.651" "72.54.39.148" "RECEIVED: 250-mail.adso.com Hello mail.intensifytech.com [76.213.79.2], pleased to meet you.[nl]250-ENHANCEDSTATUSCODES[nl]250-SIZE[nl]250-EXPN[nl]250-ETRN[nl]250-ATRN[nl]250-DSN[nl]250-CHECKPOINT[nl]250-8BITMIME[nl]250-AUTH PLAIN LOGIN DIGEST-MD5 CRAM-MD5 GSSAPI[nl]250 HELP"
"SMTPC" 5680 68294 "2016-04-19 19:08:09.651" "72.54.39.148" "SENT: MAIL FROM:<nag@intensifytech.com>"
"SMTPC" 5680 68294 "2016-04-19 19:08:09.857" "72.54.39.148" "RECEIVED: 250 2.1.0 <nag@intensifytech.com>... Sender ok"
"SMTPC" 5680 68294 "2016-04-19 19:08:09.857" "72.54.39.148" "SENT: RCPT TO:<dinesh@silverxis.com>"
"SMTPC" 5612 68294 "2016-04-19 19:08:09.888" "72.54.39.148" "RECEIVED: 550 5.1.1 <dinesh@silverxis.com> User unknown; rejecting"
"SMTPC" 5612 68294 "2016-04-19 19:08:09.888" "72.54.39.148" "SENT: QUIT"
"SMTPC" 4600 68294 "2016-04-19 19:08:09.920" "72.54.39.148" "RECEIVED: 221 2.0.0 mail.adso.com closing connection"
IP Ranges
----------
Local 192.168.1.65 to 192.168.1.254 Priority 20 <-- This my router local network for ip.
Localhost 76.213.79.2 to 76.213.79.2 P 19
MyComputer 127.0.0.1 to 127.0.0.1 P 15
Internet 0.0.0.0 to 255.255.255.255 P10
all are SMTP authenticated and No external to external.
Please tell me how to resolve this issue?