Re: Anyone from Proof Point or Comcast on this list?
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 on behalf of Matt Hoppes Sent: Monday, April 19, 2021 10:06:00 PM To: North American Network Operators' Group 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:i...@rivervalleyinternet.net 250 2.1.0 Sender ok rcpt to:dr[redacted]@comcast.net 550 5.7.1 Relaying denied
Re: Anyone from Proof Point or Comcast on this list?
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
Re: Anyone from Proof Point or Comcast on this list?
https://list.mailop.org/listinfo/mailop - Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP - Original Message - From: "Matt Hoppes" To: "North American Network Operators' Group" 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:i...@rivervalleyinternet.net 250 2.1.0 Sender ok rcpt to:dr[redacted]@comcast.net 550 5.7.1 Relaying denied
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:i...@rivervalleyinternet.net 250 2.1.0 Sender ok rcpt to:dr[redacted]@comcast.net 550 5.7.1 Relaying denied
