Anyone from Proof Point or Comcast on this list?
It seems we are having trouble sending e-mail to some Comcast customers and getting a relaying denied message, even though the mail should be being accepted, not relayed. Below is a copy of a transcript. Could someone from Proof Point or Comcast e-mail please contact me to resolve this? [root@account ~]# dig mx comcast.com ; <<>> DiG 9.11.4-P2-RedHat-9.11.4-16.P2.el7_8.6 <<>> mx comcast.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32690 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;comcast.com. IN MX ;; ANSWER SECTION: comcast.com. 9 IN MX 5 mxb-00143702.gslb.pphosted.com. comcast.com. 9 IN MX 5 mxa-00143702.gslb.pphosted.com. ;; Query time: 0 msec ;; SERVER: 172.16.0.21#53(172.16.0.21) ;; WHEN: Mon Apr 19 12:33:57 EDT 2021 ;; MSG SIZE rcvd: 112 [root@account ~]# telnet mxb-00143702.gslb.pphosted.com 25 Trying 148.163.141.77... Connected to mxb-00143702.gslb.pphosted.com. Escape character is '^]'. 220 mx0b-00143702.pphosted.com ESMTP mfa-m0184889 helo rivervalleyinternet.net 250 mx0b-00143702.pphosted.com Hello [192.81.87.236], pleased to meet you mail from:info@rivervalleyinternet.net 250 2.1.0 Sender ok rcpt to:dr[redacted]@comcast.net 550 5.7.1 Relaying denied
https://list.mailop.org/listinfo/mailop ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "Matt Hoppes" <mattlists@rivervalleyinternet.net> To: "North American Network Operators' Group" <nanog@nanog.org> Sent: Monday, April 19, 2021 11:36:00 AM Subject: Anyone from Proof Point or Comcast on this list? It seems we are having trouble sending e-mail to some Comcast customers and getting a relaying denied message, even though the mail should be being accepted, not relayed. Below is a copy of a transcript. Could someone from Proof Point or Comcast e-mail please contact me to resolve this? [root@account ~]# dig mx comcast.com ; <<>> DiG 9.11.4-P2-RedHat-9.11.4-16.P2.el7_8.6 <<>> mx comcast.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32690 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;comcast.com. IN MX ;; ANSWER SECTION: comcast.com. 9 IN MX 5 mxb-00143702.gslb.pphosted.com. comcast.com. 9 IN MX 5 mxa-00143702.gslb.pphosted.com. ;; Query time: 0 msec ;; SERVER: 172.16.0.21#53(172.16.0.21) ;; WHEN: Mon Apr 19 12:33:57 EDT 2021 ;; MSG SIZE rcvd: 112 [root@account ~]# telnet mxb-00143702.gslb.pphosted.com 25 Trying 148.163.141.77... Connected to mxb-00143702.gslb.pphosted.com. Escape character is '^]'. 220 mx0b-00143702.pphosted.com ESMTP mfa-m0184889 helo rivervalleyinternet.net 250 mx0b-00143702.pphosted.com Hello [192.81.87.236], pleased to meet you mail from:info@rivervalleyinternet.net 250 2.1.0 Sender ok rcpt to:dr[redacted]@comcast.net 550 5.7.1 Relaying denied
On 2021-04-19 12:36 p.m., Matt Hoppes wrote:
It seems we are having trouble sending e-mail to some Comcast customers and getting a relaying denied message, even though the mail should be being accepted, not relayed.
Below is a copy of a transcript. Could someone from Proof Point or Comcast e-mail please contact me to resolve this?
Have you tried the Proofpoint reputation and remediation portal? https://ipcheck.proofpoint.com/ ~ Matt
comcast.com is their corporate mail domain comcast.net is their customer domain Both have entirely different mx hosts and won’t relay mail for each other. --srs ________________________________ From: NANOG <nanog-bounces+ops.lists=gmail.com@nanog.org> on behalf of Matt Hoppes <mattlists@rivervalleyinternet.net> Sent: Monday, April 19, 2021 10:06:00 PM To: North American Network Operators' Group <nanog@nanog.org> Subject: Anyone from Proof Point or Comcast on this list? It seems we are having trouble sending e-mail to some Comcast customers and getting a relaying denied message, even though the mail should be being accepted, not relayed. Below is a copy of a transcript. Could someone from Proof Point or Comcast e-mail please contact me to resolve this? [root@account ~]# dig mx comcast.com ; <<>> DiG 9.11.4-P2-RedHat-9.11.4-16.P2.el7_8.6 <<>> mx comcast.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32690 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;comcast.com. IN MX ;; ANSWER SECTION: comcast.com. 9 IN MX 5 mxb-00143702.gslb.pphosted.com. comcast.com. 9 IN MX 5 mxa-00143702.gslb.pphosted.com. ;; Query time: 0 msec ;; SERVER: 172.16.0.21#53(172.16.0.21) ;; WHEN: Mon Apr 19 12:33:57 EDT 2021 ;; MSG SIZE rcvd: 112 [root@account ~]# telnet mxb-00143702.gslb.pphosted.com 25 Trying 148.163.141.77... Connected to mxb-00143702.gslb.pphosted.com. Escape character is '^]'. 220 mx0b-00143702.pphosted.com ESMTP mfa-m0184889 helo rivervalleyinternet.net 250 mx0b-00143702.pphosted.com Hello [192.81.87.236], pleased to meet you mail from:info@rivervalleyinternet.net 250 2.1.0 Sender ok rcpt to:dr[redacted]@comcast.net 550 5.7.1 Relaying denied
participants (4)
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Matt Hoppes -
Matthew V -
Mike Hammett -
Suresh Ramasubramanian