User:Woozle/2016/11/13/GMail silently dropping messages from cloud2

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Log of test email sent to my GMail account and not received:

Nov 13 16:01:40 cloud2 postfix/smtpd[29093]: connect from unknown[50.111.120.89]
Nov 13 16:01:41 cloud2 postfix/smtpd[29093]: BBD0B140620: client=unknown[50.111.120.89], sasl_method=PLAIN, sasl_username=woozle
Nov 13 16:01:41 cloud2 postfix/cleanup[29095]: BBD0B140620: message-id=<e7384770-3194-dfed-3d24-f519e44420b1@hypertwins.org>
Nov 13 16:01:41 cloud2 postfix/qmgr[2457]: BBD0B140620: from=<woozle@hypertwins.org>, size=617, nrcpt=2 (queue active)
Nov 13 16:01:41 cloud2 postfix/cleanup[29095]: E5D24140621: message-id=<e7384770-3194-dfed-3d24-f519e44420b1@hypertwins.org>
Nov 13 16:01:41 cloud2 postfix/smtp[29096]: BBD0B140620: to=<woozalia@gmail.com>, relay=none, delay=0.27, delays=0.26/0/0/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=gmail.com type=MX: Host not found, try again)
Nov 13 16:01:41 cloud2 postfix/qmgr[2457]: E5D24140621: from=<woozle@hypertwins.org>, size=779, nrcpt=1 (queue active)
Nov 13 16:01:41 cloud2 postfix/local[29097]: BBD0B140620: to=<default-hypertwins.org@cloud2.hypertwins.net>, orig_to=<bcc@hypertwins.org>, relay=local, delay=0.27, delays=0.26/0/0/0, dsn=2.0.0, status=sent (forwarded as E5D24140621)
Nov 13 16:01:41 cloud2 postfix/local[29097]: E5D24140621: to=<harena@cloud2.hypertwins.net>, orig_to=<bcc@hypertwins.org>, relay=local, delay=0.03, delays=0/0/0/0.03, dsn=2.0.0, status=sent (delivered to command: /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME)
Nov 13 16:01:42 cloud2 postfix/local[29097]: E5D24140621: to=<woozle@cloud2.hypertwins.net>, orig_to=<bcc@hypertwins.org>, relay=local, delay=0.06, delays=0/0/0/0.06, dsn=2.0.0, status=sent (delivered to command: /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME)
Nov 13 16:01:42 cloud2 postfix/qmgr[2457]: E5D24140621: removed
Nov 13 16:01:42 cloud2 postfix/smtpd[29093]: disconnect from unknown[50.111.120.89]

Problem seems to be on cloud2 -- not resolving any domain names. Test after rebooting produced this:

Nov 13 16:08:49 cloud2 postfix/smtp[3128]: connect to gmail-smtp-in.l.google.com[2607:f8b0:400d:c07::1a]:25: Connection timed out
Nov 13 16:08:49 cloud2 postfix/smtpd[3183]: warning: hostname m121.mediumthings.net does not resolve to address 185.40.4.121: Name or service not known
Nov 13 16:08:49 cloud2 postfix/smtpd[3183]: connect from unknown[185.40.4.121]
Nov 13 16:08:49 cloud2 postfix/smtp[3128]: 767C4140500: to=<woozalia@gmail.com>, relay=gmail-smtp-in.l.google.com[173.194.204.27]:25, delay=30, delays=0.21/0.01/30/0.1, dsn=2.0.0, status=sent (250 2.0.0 OK 1479071329 i129si13437193qkd.111 - gsmtp)
Nov 13 16:08:49 cloud2 postfix/qmgr[2396]: 767C4140500: removed
Nov 13 16:08:50 cloud2 postfix/smtpd[2482]: connect from mail-it0-f46.google.com[209.85.214.46]
Nov 13 16:08:50 cloud2 postfix/smtpd[2482]: B2B3B140500: client=mail-it0-f46.google.com[209.85.214.46]
Nov 13 16:08:50 cloud2 postfix/cleanup[2839]: B2B3B140500: message-id=<507cb59e-1238-4d94-411b-e406fd85d6c9@hypertwins.org>
Nov 13 16:08:50 cloud2 postfix/qmgr[2396]: B2B3B140500: from=<woozalia+caf_=gmail-w-fwd=hypertwins.org@gmail.com>, size=3106, nrcpt=1 (queue active)
Nov 13 16:08:50 cloud2 postfix/cleanup[2487]: CAECC140501: message-id=<507cb59e-1238-4d94-411b-e406fd85d6c9@hypertwins.org>
Nov 13 16:08:50 cloud2 postfix/local[2838]: B2B3B140500: to=<default-hypertwins.org@cloud2.hypertwins.net>, orig_to=<gmail-w-fwd@hypertwins.org>, relay=local, delay=0.1, delays=0.1/0/0/0, dsn=2.0.0, status=sent (forwarded as CAECC140501)
Nov 13 16:08:50 cloud2 postfix/qmgr[2396]: CAECC140501: from=<woozalia+caf_=gmail-w-fwd=hypertwins.org@gmail.com>, size=3268, nrcpt=1 (queue active)
Nov 13 16:08:50 cloud2 postfix/qmgr[2396]: B2B3B140500: removed
Nov 13 16:08:50 cloud2 postfix/smtpd[2482]: disconnect from mail-it0-f46.google.com[209.85.214.46]
Nov 13 16:08:51 cloud2 postfix/local[2489]: CAECC140501: to=<harena@cloud2.hypertwins.net>, orig_to=<gmail-w-fwd@hypertwins.org>, relay=local, delay=0.8, delays=0/0/0/0.8, dsn=2.0.0, status=sent (delivered to command: /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME)

(Not sure where the session actually began.)

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