[Bug 1805027] Re: systemd-resolved can't resolve Comcast mail server addresses

Wed May 15 05:43:22 UTC 2019

*** This bug is a duplicate of bug 1811471 ***
    https://bugs.launchpad.net/bugs/1811471

The same symptons appear for "emea.mail.microsoft.com" even with systemd
237-3ubuntu10.21 from -updates.

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https://bugs.launchpad.net/bugs/1805027

Title:
  systemd-resolved can't resolve Comcast mail server addresses

Status in systemd package in Ubuntu:
  Triaged

Bug description:
  1) Ubuntu release:  18.10
  2) systemd-resolved version: (Default latest version that comes with Ubuntu 18.10)
  3) Expected behavior: Comcast's POP3 mail server addresses to be resolved to IP addresses
  4) Actual behavior:  Comcast's POP3 mail server addresses can't be resolved to IP addresses

  Starting on Monday, November 19, 2018, Comcast made a DNS change
  related to its POP3 mail servers (mail.comcast.net and
  pop3.comcast.net) that prevent resolved from being able to resolve
  those domains into IP addresses.  When I try to ping either host
  (mail.comcast.net or pop2.comcast.net), I get this error:

  tom at deathstar:~$ ping mail.comcast.net
  ping: mail.comcast.net: Name or service not known
  tom at deathstar:~$

  When I manually lookup up the domain, I get these results:

  tom at deathstar:~$ nslookup mail.comcast.net
  Server:		127.0.0.53
  Address:	127.0.0.53#53

  Non-authoritative answer:
  mail.comcast.net	canonical name = imap.ge.xfinity.com.
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.209
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.197
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.233
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.225
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.226
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.217
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.208
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.230
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.232
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.218
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.211
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.242
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.221
  Name:	imap.ge.xfinity.com
  Address: 96.118.242.196
  Name:	imap.ge.xfinity.com
  Address: 96.118.208.40
  Name:	imap.ge.xfinity.com
  Address: 96.118.208.99
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc11:9:f816:3eff:fee8:4f07
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc11:9:f816:3eff:fe7d:1b0c
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc11:9:f816:3eff:fe25:5ae5
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc11:9:f816:3eff:fef6:babc
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc11:9:f816:3eff:fe87:c172
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc11:9:f816:3eff:fee6:7a57
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc11:9:f816:3eff:fe0f:a4a
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc11:2:f816:3eff:fec7:cb93
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fee2:1000:f816:3eff:fe42:4f14
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc18:0:f816:3eff:fe33:9aaa
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc18:0:f816:3eff:feb2:8c0d
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc18:0:f816:3eff:fef1:25a5
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc18:0:f816:3eff:febd:320a
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc18:0:f816:3eff:fe36:aba3
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc18:0:f816:3eff:fe3f:76f2
  Name:	imap.ge.xfinity.com
  Address: 2001:558:fc18:0:f816:3eff:fe45:1d1e

  tom at deathstar:~$ dig mail.comcast.net

  ; <<>> DiG 9.11.4-3ubuntu5-Ubuntu <<>> mail.comcast.net
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15037
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 17, AUTHORITY: 0, ADDITIONAL: 1

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 65494
  ;; QUESTION SECTION:
  ;mail.comcast.net.		IN	A

  ;; ANSWER SECTION:
  mail.comcast.net.	15	IN	CNAME	imap.ge.xfinity.com.
  imap.ge.xfinity.com.	12	IN	A	96.117.3.119
  imap.ge.xfinity.com.	12	IN	A	96.117.3.96
  imap.ge.xfinity.com.	12	IN	A	96.117.3.143
  imap.ge.xfinity.com.	12	IN	A	96.117.3.145
  imap.ge.xfinity.com.	12	IN	A	96.117.3.129
  imap.ge.xfinity.com.	12	IN	A	96.117.3.148
  imap.ge.xfinity.com.	12	IN	A	96.117.3.201
  imap.ge.xfinity.com.	12	IN	A	96.117.3.136
  imap.ge.xfinity.com.	12	IN	A	96.118.133.238
  imap.ge.xfinity.com.	12	IN	A	96.117.3.128
  imap.ge.xfinity.com.	12	IN	A	96.117.3.144
  imap.ge.xfinity.com.	12	IN	A	96.117.2.238
  imap.ge.xfinity.com.	12	IN	A	96.117.3.110
  imap.ge.xfinity.com.	12	IN	A	96.117.3.140
  imap.ge.xfinity.com.	12	IN	A	96.117.3.154
  imap.ge.xfinity.com.	12	IN	A	96.117.3.132

  ;; Query time: 13 msec
  ;; SERVER: 127.0.0.53#53(127.0.0.53)
  ;; WHEN: Tue Nov 20 06:58:31 PST 2018
  ;; MSG SIZE  rcvd: 334

  tom at deathstar:~$

  Before November 19, 2018, everything was working fine.   The initial
  indication there was a problem was Mozilla Thunderbird failed to
  connect to Comcast's POP3 mail server.  Once I did some investigation,
  I found the information above.

  I have since disabled system-resolved and have installed "Unbound".
  After installing "Unbound", I'm able to ping "mail.comcast.net"
  without issue and Mozilla Thunderbird can contact successfully
  Comcast's POP3 mail servers.

  I started a thread about this on Ubuntuforums.org:

  https://ubuntuforums.org/showthread.php?t=2406399

  and others report being impacted by this as well.

  Let me know if more information is needed!  Thanks!

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