They had a massive power failure this morning. They may have been trying to 
reroute traffic + there may be some stale routes out there. Might be worth 
opening a ticket with them to investigate.
https://status.mimecast.com/

-----Original Message-----
From: Outages <[email protected]> On Behalf Of Mike Lewinski via 
Outages
Sent: Tuesday, May 3, 2022 9:49 AM
To: outages ([email protected]) <[email protected]>
Subject: [EXTERNAL] [outages] Mimecast SMTP outage

I'm unable to reach the SMTP service on us-smtp-inbound-1.mimecast.com or 
us-smtp-inbound-2.mimecast.com from multiple markets: Dallas, Denver, Phoenix. 
I can reach them from Atlanta and Seattle. They are reachable on at least one 
address in Los Angeles, unreachable on others.

Dallas:

$ telnet us-smtp-inbound-1.mimecast.com 25 Trying 205.139.110.221...
Trying 207.211.30.221...
Trying 207.211.30.141...
Trying 205.139.110.141...
Trying 205.139.110.242...
Trying 207.211.30.242...
telnet: Unable to connect to remote host: Connection timed out

Denver:

$ telnet us-smtp-inbound-1.mimecast.com 25 Trying 207.211.30.221...
Trying 207.211.30.242...
Trying 207.211.30.141...
Trying 205.139.110.242...
Trying 205.139.110.221...
Trying 205.139.110.141...
telnet: Unable to connect to remote host: Connection timed out

Finally found one host in LA that worked after two failures:

$ telnet us-smtp-inbound-1.mimecast.com 25 Trying 205.139.110.221...
Trying 205.139.110.141...
Trying 207.211.30.242...
Connected to us-smtp-inbound-1.mimecast.com.
Escape character is '^]'.
220 us-smtp-1.mimecast.com ESMTP; Tue, 03 May 2022 12:38:11 -0400 QUIT
221 Service closing transmission channel [uajtgwEROGqfo99gP4hQyg.us397] 
Connection closed by foreign host.

$ mtr -r -c3 -w 205.139.110.221
Start: 2022-05-03T10:43:06-0600
HOST: los-angeles                                Loss%   Snt   Last   Avg  Best 
 Wrst StDev
  1.|-- LA624-C6504-1-VL624.massivenetworks.net  0.0%     3    0.6   0.5   0.5  
 0.6   0.1
  2.|-- 199.45.152.18                            0.0%     3    0.4   0.4   0.4  
 0.4   0.0
  3.|-- xe-10-0-0.edge1.LosAngeles9.Level3.net   0.0%     3    4.7   2.0   0.6  
 4.7   2.4
  4.|-- ???                                     100.0     3    0.0   0.0   0.0  
 0.0   0.0
  5.|-- MIMECAST-SE.ear1.NewYork6.Level3.net     0.0%     3   68.8  68.8  68.7  
68.8   0.1
  6.|-- ???                                     100.0     3    0.0   0.0   0.0  
 0.0   0.0
$ mtr -r -c3 -w 207.211.30.242
Start: 2022-05-03T10:47:11-0600
HOST: los-angeles                                Loss%   Snt   Last   Avg  Best 
 Wrst StDev
  1.|-- LA624-C6504-1-VL624.massivenetworks.net        0.0%     3    0.6   0.5  
 0.4   0.6   0.1
  2.|-- 199.45.152.18                                  0.0%     3    0.4   0.4  
 0.4   0.5   0.1
  3.|-- et-0-0-6-2.cr4-lax2.ip4.gtt.net                0.0%     3    0.4   0.5  
 0.4   0.6   0.1
  4.|-- ae23.cr3-lax1.ip4.gtt.net                      0.0%     3    1.3   1.3  
 1.1   1.3   0.1
  5.|-- ae-3.r01.lsanca07.us.bb.gin.ntt.net            0.0%     3    1.3   1.2  
 1.2   1.3   0.1
  6.|-- ???                                           100.0     3    0.0   0.0  
 0.0   0.0   0.0
  7.|-- ae-3.r24.snjsca04.us.bb.gin.ntt.net           33.3%     3   15.4  13.7  
12.1  15.4   2.4
  8.|-- ae-8.r23.chcgil09.us.bb.gin.ntt.net            0.0%     3   57.3  58.0  
57.3  58.9   0.8
  9.|-- ae-0.r22.chcgil09.us.bb.gin.ntt.net            0.0%     3   64.4  61.5  
58.9  64.4   2.8
 10.|-- ae-6.r21.nwrknj03.us.bb.gin.ntt.net            0.0%     3   69.7  71.2  
69.4  74.6   2.9
 11.|-- ae-11.r01.nycmny17.us.bb.gin.ntt.net           0.0%     3   70.2  70.0  
69.8  70.2   0.2
 12.|-- ce-0-8-0-3-200.r01.nycmny17.us.ce.gin.ntt.net  0.0%     3   74.9  87.4  
74.9 112.2  21.5
 13.|-- ???                                           100.0     3    0.0   0.0  
 0.0   0.0   0.0
$

Phoenix:

$ telnet us-smtp-inbound-1.mimecast.com 25 Trying 207.211.30.141...
Trying 207.211.30.221...
Trying 205.139.110.141...
Trying 205.139.110.242...
Trying 207.211.30.242...
Trying 205.139.110.221...
telnet: Unable to connect to remote host: Connection timed out $

Seattle:

$ telnet us-smtp-inbound-1.mimecast.com 25 Trying 207.211.30.141...
Connected to us-smtp-inbound-1.mimecast.com.
Escape character is '^]'.
220 us-smtp-1.mimecast.com ESMTP; Tue, 03 May 2022 12:34:04 -0400 QUIT
221 Service closing transmission channel [0EM41sKhMWizUnOQs3cnYQ.us479] 
Connection closed by foreign host.

$ mtr -r -c3 -w us-smtp-inbound-1.mimecast.com
Start: 2022-05-03T10:37:23-0600
HOST: seattle                              Loss%   Snt   Last   Avg  Best  Wrst 
StDev
  1.|-- 204.144.179.129                       0.0%     3    0.4   0.4   0.4   
0.5   0.0
  2.|-- 9-1-4.ear1.Seattle3.Level3.net        0.0%     3    0.5   0.6   0.5   
0.7   0.1
  3.|-- ???                                  100.0     3    0.0   0.0   0.0   
0.0   0.0
  4.|-- MIMECAST-SE.ear1.NewYork6.Level3.net  0.0%     3   76.6  76.6  76.5  
76.7   0.1
  5.|-- ???                                  100.0     3    0.0   0.0   0.0   
0.0   0.0
$


Atlanta:

$ telnet us-smtp-inbound-1.mimecast.com 25 Trying 207.211.30.242...
Connected to us-smtp-inbound-1.mimecast.com.
Escape character is '^]'.
220 us-smtp-1.mimecast.com ESMTP; Tue, 03 May 2022 12:08:11 -0400 QUIT
221 Service closing transmission channel [M0wFRdZ-NhONlAOBhS22Sg.us227] 
Connection closed by foreign host.

$ mtr 207.211.30.242 -w -r -c 3
Start: Tue May  3 10:17:58 2022
HOST: atlanta                                    Loss%   Snt   Last   Avg  Best 
 Wrst StDev
  1.|-- Atl55-C6504-1-VL412.massivenetworks.net        0.0%     3    0.3   0.4  
 0.3   0.7   0.0
  2.|-- 6-2-2.ear3.Atlanta2.Level3.net                 0.0%     3    0.3   0.3  
 0.3   0.3   0.0
  3.|-- 4.69.217.206                                   0.0%     3   17.9   7.3  
 1.5  17.9   9.1
  4.|-- NTT-level3-100G.Atlanta2.Level3.net            0.0%     3    1.1   1.0  
 0.8   1.1   0.0
  5.|-- ae-4.r23.atlnga05.us.bb.gin.ntt.net            0.0%     3    1.3   2.6  
 0.5   6.0   2.9
  6.|-- ae-4.r25.asbnva02.us.bb.gin.ntt.net            0.0%     3   13.0  13.6  
13.0  14.2   0.0
  7.|-- ae-4.r21.nwrknj03.us.bb.gin.ntt.net           33.3%     3   18.9  18.8  
18.7  18.9   0.0
  8.|-- ae-11.r01.nycmny17.us.bb.gin.ntt.net           0.0%     3   19.3  19.2  
19.0  19.3   0.0
  9.|-- ce-0-8-0-3-200.r01.nycmny17.us.ce.gin.ntt.net  0.0%     3   24.8  24.7  
24.5  24.8   0.0
 10.|-- ???                                           100.0     3    0.0   0.0  
 0.0   0.0   0.0

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