Mail is not delivering to a specific address

[gtuhin]

Dear Sir,

One of our email user's mail is not delivering to a specific address. Please find below detail.

from address: jabed@trigonindustries.com
to address: ranjit@usfcollections.com

in return mail it is telling "550 5.7.1 Message rejected due to content restrictions".

Domain name and IP address is listed in LASHBACK. Is the reason for not delivering the mail? Please see the below.

===============
[root@mail ~]# telnet smtpedge01.chinookcommunications.com 25
Trying 173.225.22.201...
Connected to smtpedge01.chinookcommunications.com (173.225.22.201).
Escape character is '^]'.
220 smtpedge.partnerhosted.com Microsoft ESMTP MAIL Service ready at Thu, 6 Nov 2014 22:15:00 -0800
ehlo usfcollections.com
250-smtpedge.partnerhosted.com Hello [203.112.76.146]
250-SIZE 31457280
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-X-ANONYMOUSTLS
250-AUTH
250-X-EXPS NTLM
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250-XEXCH50
250 XSHADOW
mail from: gtuhin@gmail.com
250 2.1.0 Sender OK
rcpt to: ranjit@usfcollections.com
250 2.1.5 Recipient OK
data
354 Start mail input; end with <CRLF>.<CRLF>
This is a test mail. Plz just ignore.
.
250 2.6.0 <9bbbcf6b-95c5-4cce-8000-eb4f12bcefc0@Xedge01.citservers.local> [InternalId=5853238] Queued mail for delivery
quit
221 2.0.0 Service closing transmission channel
Connection closed by foreign host.
[root@mail ~]#
[root@mail ~]#


[root@mail ~]# telnet smtpedge01.chinookcommunications.com 25
Trying 173.225.22.201...
Connected to smtpedge01.chinookcommunications.com (173.225.22.201).
Escape character is '^]'.
220 smtpedge.partnerhosted.com Microsoft ESMTP MAIL Service ready at Thu, 6 Nov 2014 22:16:44 -0800
ehlo usfcollections.com
250-smtpedge.partnerhosted.com Hello [203.112.76.146]
250-SIZE 31457280
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-X-ANONYMOUSTLS
250-AUTH
250-X-EXPS NTLM
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250-XEXCH50
250 XSHADOW
mail from: jabed@trigonindustries.com
250 2.1.0 Sender OK
rcpt to: ranjit@usfcollections.com
250 2.1.5 Recipient OK
data
354 Start mail input; end with <CRLF>.<CRLF>
This is a test mail. Please just ignore.
.
550 5.7.1 Message rejected due to content restrictions
quit
221 2.0.0 Service closing transmission channel
Connection closed by foreign host.
=========================

Please suggest what to do?

Regards,

Tuhin.
BD, Dhaka.

 

[EQ Admin]

Hello,

The Lashback wold apply to all connections from your mail server, so I doubt that's part of the problem.

Most likely the receiving mail server blocked email from your domain name or specifically from your email address.

Try sending from other email addresses in your domain, are all of them blocked or only from jabed@trigonindustries.com?

Is your outgoing IP address 203.112.76.146? That IP has a terrible sender score:

https://senderscore.org/lookup.php?lookup=203.112.76.146&validLookup=true

It appears your domain name and possibly your sending IP address have a terrible reputation.

Get that mail server and IP cleaned up, and fix anuy other abuse issues leaving your network, create an SPF record, and then once the sender score improves to above 70 try contacting or calling usfcollections.com and asking if there is anything more that can be done so you can email the person in the domain that you are trying to reach.

You can also try contacting abuse@chinookcommunications.com after your reputation is fixed.

 

[gtuhin]

Thank you very much for your reply. It helped me a lot.

Thanks.
Tuhin.