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Emails are being rejected from one of the external domain
Since past few days, I am not able to send email to any person one specific domain, I would call it xyxyxyxy.org. I am not sure if some changes were done on our network side or recipient's side.
When I sent test email from my unix server, I can see below message on /var/log/maillog
Jan 3 14:36:37 mail-relay-server postfix/smtp[114581]: CA0BA102B6E4: to=brian.harp@xyxyxyxy.org, relay=smtp1.xyxyxyxy.org[74.120.152.76]:25, delay=0.06, delays=0.01/0/0.05/0, dsn=4.0.0, status=deferred (host smtp1.xyxyxyxy.org[74.120.152.76] refused to talk to me: 554 No SMTPd here 202201032236360132090;12)
And this test too
[root@mail-relay-server ~]# telnet smtp1.xyxyxyxy.org 25
Trying 74.120.152.76...
Connected to smtp1.xyxyxyxy.org.
Escape character is '^]'.
554 No SMTPd here 202201032250260132555;12
Connection closed by foreign host.
[root@mail-relay-server ~]# telnet smtp2.xyxyxyxy.org 25
Trying 74.120.152.77...
Connected to smtp2.xyxyxyxy.org.
Escape character is '^]'.
554 No SMTPd here 202201032250310278916;10
Connection closed by foreign host.
[root@mail-relay-server ~]#
Does it mean that recipient's domain is rejecting our mail and I should follow with them or something could be on our network or our mail server? All other emails and external emails are going as it is.
Thanks
Unix OS* Postfix
Last Comment
arnold
ASKER
Okay, here is the domain and it is able to resolve
[root@mail-relay-server ~]# nslookup -q=mx portlandoregon.gov
Server: 192.168.123.44
Address: 192.168.123.44#53
Non-authoritative answer:
portlandoregon.gov mail exchanger = 10 smtp2.portlandoregon.gov.
portlandoregon.gov mail exchanger = 10 smtp1.portlandoregon.gov.
Authoritative answers can be found from:
portlandoregon.gov nameserver = ns2.portlandoregon.gov.
portlandoregon.gov nameserver = ns1.portlandoregon.gov.
smtp2.portlandoregon.gov internet address = 74.120.152.77
smtp1.portlandoregon.gov internet address = 74.120.152.76
ns1.portlandoregon.gov internet address = 74.120.152.97
ns2.portlandoregon.gov internet address = 74.120.152.197
[root@mail-relay-server ~]#
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What is the domain, check the MX records.
nslookup -q=mx domainname.suffi
Have you considered calling them?
whois domainname.com and call the technical contact.
if you lookup the IP you can check the arin registration, and call their technical contact if it is affiliated with the organization versus an ISP.
The MX is helpful if there are two listings, it might be possible to try the other and see if you can establish an SMTP connection. if that works, you could setup a conditional forwarder for the domain to use the SMTP connection that works versus the one that does not.
Though, notifying them of the issue might be a straightforward thing to do.
"Hey, your mail servers are down, messages sent to your arganization are being rejected..."