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#25 2021-04-09 02:28:01

phiw13
Plugin Author
From: Japan
Registered: 2004-02-27
Posts: 2,844
Website

Re: Email notifications fail ?

Reviving again…

Since yesterday, again no forum notifications in my inbox. The last one was a notification for the post by user “planeth” in the ‘Alpha & beta testers request: Textpattern IRC^H Matrix server’ thread. Timestamp 2021-04-07 22:26:53 JST.


Where is that emoji for a solar powered submarine when you need it ?

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#26 2021-04-09 13:00:53

gaekwad
Server grease monkey
From: People's Republic of Cornwall
Registered: 2005-11-19
Posts: 3,972
GitHub

Re: Email notifications fail ?

Ugh. OK, I’ll have a look. Please hold.

Edit: 30+ emails in the queue with (Host or domain name not found. Name service error for name=example.com type=MX: Host not found, try again) error. Nothing changed in the last week or more, so not sure what’s happening there. Leave it with me, expect emails to start flowing soon.

Last edited by gaekwad (2021-04-09 13:04:04)

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#27 2021-04-09 13:21:03

gaekwad
Server grease monkey
From: People's Republic of Cornwall
Registered: 2005-11-19
Posts: 3,972
GitHub

Re: Email notifications fail ?

Fixed. This happened (out of nowhere): askubuntu.com/questions/1292650/resolv-conf-no-dns-servers-known

I’ve tweaked settings and updated my build guide to pre-emptively set known-good DNS, which should hopefully avoid this in future.

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#28 2021-04-09 13:25:09

phiw13
Plugin Author
From: Japan
Registered: 2004-02-27
Posts: 2,844
Website

Re: Email notifications fail ?

gaekwad wrote #329743:

Ugh. OK, I’ll have a look. Please hold.

gaekwad wrote #329745:

Fixed. […]

OK, the six or so email I could expect arrived nicely, together. Thanks for keeping up with that.


Where is that emoji for a solar powered submarine when you need it ?

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#29 2021-04-09 13:31:50

gaekwad
Server grease monkey
From: People's Republic of Cornwall
Registered: 2005-11-19
Posts: 3,972
GitHub

Re: Email notifications fail ?

phiw13 wrote #329747:

OK, the six or so email I could expect arrived nicely, together.

Great news, thanks for letting me know. There were ~35 emails all processed at the same time, the queue is now back to zero. It’s not an error I’ve encountered before, but I’m going through our servers now to check they’re OK.

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#30 2021-04-09 13:39:32

phiw13
Plugin Author
From: Japan
Registered: 2004-02-27
Posts: 2,844
Website

Re: Email notifications fail ?

gaekwad wrote #329748:

Great news, thanks for letting me know.

… and the notification for that post arrived instantly. We are probably good for a while :–)


Where is that emoji for a solar powered submarine when you need it ?

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#31 2021-04-09 13:51:57

gaekwad
Server grease monkey
From: People's Republic of Cornwall
Registered: 2005-11-19
Posts: 3,972
GitHub

Re: Email notifications fail ?

phiw13 wrote #329749:

… and the notification for that post arrived instantly. We are probably good for a while :–)

Let’s hope so! The way our servers work is they use themselves for DNS lookups, and the upstream DNS defaults to (and is operated by) DigitalOcean. For whatever reason, that upstream seemed to break and the resolution went south.

From here, I’ve hard-coded IPv4 and IPv6 for Cloudflare and Quad9 instead of relying on provider DNS:

$ cat /etc/systemd/resolved.conf
[Resolve]
DNS=1.1.1.1 9.9.9.9 2606:4700:4700::1111 2620:fe::fe

…and so unless the hot mess intricacies of systemd breaks it, we’ve got it sorted it from here.

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#32 2023-03-10 06:10:09

phiw13
Plugin Author
From: Japan
Registered: 2004-02-27
Posts: 2,844
Website

Re: Email notifications fail ?

Redux, march 2023, the issue returns [*] :-(

Since Wednesday (08/03) I haven’t again received any email notification for updated threads. Same email address as before.

–^–
[*] sounds like a Disney/star wars joint venture


Where is that emoji for a solar powered submarine when you need it ?

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#33 2023-03-10 08:42:10

gaekwad
Server grease monkey
From: People's Republic of Cornwall
Registered: 2005-11-19
Posts: 3,972
GitHub

Re: Email notifications fail ?

phiw13 wrote #334999:

Since Wednesday (08/03) I haven’t again received any email notification for updated threads. Same email address as before.

Weird. No email queued this side:

$ sudo mailq
Mail queue is empty

It’s Apple (iCloud) filtering, according to /var/log/mail.log:

Mar  9 11:26:26 tarzan postfix/smtp[64294]: 6AC6E1F81ED: to=<REDACTED@me.com>, relay=mx01.mail.icloud.com[17.57.154.33]:25, delay=2.4, delays=0.02/0.07/0.97/1.4, dsn=5.7.1, status=bounced (host mx01.mail.icloud.com[17.57.154.33] said: 554 5.7.1 [HM08] Message rejected due to local policy. Please visit https://support.apple.com/en-us/HT204137  (in reply to end of DATA command))

So, it might be a blocklist somewhere…let’s see:

      Hostname: tarzan
          IPv4: 164.92.219.167
 mxtoolbox.com: https://is.gd/wFVzfk
anti-abuse.org: https://is.gd/GbQYyP
      Spamhaus: https://is.gd/I649Zf
          IPv6: 2a03:b0c0:2:d0::13c8:a001
 mxtoolbox.com: https://is.gd/TQBGbS
      Spamhaus: https://is.gd/MNTxZF

…and, sure enough, the IPv6 address is on a shared net block with a mischief-maker:

check.spamhaus.org/listed/?searchterm=2a03:b0c0:2:d0::13c8:a001

We have evidence that suggests that 2a03:b0c0:2:d0::/64 or something sharing a connection with it is insecure, compromised, or infected. This can also be caused by a misconfiguration. Please check both.
The most recent detection was on: March 6 2023, 22:10:00 UTC (+/- 5 minutes)

So, it looks like something in that /64 block (from a potential of 18,446,744,073,709,551,616 IP addresses available) has done something naughty.

At this point, there’s not much I can do – our server is shipshape, maintained, and NOT chucking out spam, so all I can suggest is sit tight for a week or two until I can build out our new 2023-grade servers and see what happens in that IP space.

Edit: PS – thank you for the report.

Last edited by gaekwad (2023-03-10 08:43:13)

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#34 2023-03-10 09:23:09

phiw13
Plugin Author
From: Japan
Registered: 2004-02-27
Posts: 2,844
Website

Re: Email notifications fail ?

Thanks for checking… don’t worry too hard about me in this case.


Where is that emoji for a solar powered submarine when you need it ?

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