On #Exchange2013 I am getting the error message as follows,
generated the error '[{LRT=};{LED=450 4.7.25 Client host rejected: cannot find your hostname, [xxx.xxx.xxx.130]};{FQDN=};{IP=}]'.
I am getting this error message only when the user sends email to a particular domain.
I have recently configured SPF, DKIM, DMARC records on DNS Level by requesting the ISP.
FQDN which I am using for sending emails is mx1.xyz.com.ab which is associated with the public IP - xxx.xxx.xxx.131
I have checked the PTR records for the IP ending with.131 on mxtoolbox.com, they do exist.
I have also checked the PTR records for the IP which is mentioned in the error message, i.e. .130. Also for this IP the PTR records exist.
I have verified the PTR records throughnslookup also and the results are all same as shown in mxtoolbox.com.
Further information, I have configured the SPF Record as follows,
xyz.com.ab. IN TXT "v=spf1 mx a ptr ip4:xxx.xxx.xxx.131 ip4:xxx.xxx.xxx.130 ~all"
The mails are getting delivered to Gmail, Hotmail, and other domains. Only to a particular domain, users are not able to send the emails.
Any help would be much appreciated because this issue is now eating up my brains.
Thanks.
Faraz.
