Anyone from Proof Point or Comcast on this list?

Mon Apr 19 16:42:50 UTC 2021

https://list.mailop.org/listinfo/mailop 

----- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 

----- Original Message -----

From: "Matt Hoppes" <mattlists at rivervalleyinternet.net> 
To: "North American Network Operators' Group" <nanog at 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 at 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 at 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 at rivervalleyinternet.net 
250 2.1.0 Sender ok 
rcpt to:dr[redacted]@comcast.net 
550 5.7.1 Relaying denied 

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