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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: 4,735
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: South-Western Japan
Registered: 2004-02-27
Posts: 3,651
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: 4,735
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: South-Western Japan
Registered: 2004-02-27
Posts: 3,651
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 ?
Sand space – admin theme for Textpattern
phiw13 on Codeberg

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#35 2023-12-13 13:28:56

gaekwad
Server grease monkey
From: People's Republic of Cornwall
Registered: 2005-11-19
Posts: 4,735
GitHub

Re: Email notifications fail ?

I’ve changed some forum stuff and there’s a non-zero chance it will affect delivery to Apple-hosted email (as is now traditional).

@phiw13: please let me know if you’re seeing this and not getting the expected email(s) alerting you to replies. Thank you.

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#36 2023-12-14 03:14:44

phiw13
Plugin Author
From: South-Western Japan
Registered: 2004-02-27
Posts: 3,651
Website

Re: Email notifications fail ?

I did indeed receive an email notification.

But the email client (Apple Mail, MacOS 14.2) treated them as junk :-) That has happened for a few forum threads recently, before the latest server changes.

Thing is, after the last glitch, I changed my email address (and for added fun, I forwarded it to iCloud Mail ) – that solved the issue at the time.

Might changed it again next to my iCloud address and see what happens.


Where is that emoji for a solar powered submarine when you need it ?
Sand space – admin theme for Textpattern
phiw13 on Codeberg

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#37 2023-12-14 06:59:02

phiw13
Plugin Author
From: South-Western Japan
Registered: 2004-02-27
Posts: 3,651
Website

Re: Email notifications fail ?

phiw13 wrote #336141:

Might changed it again next to my iCloud address and see what happens.

I tried… and never received the notification mail to activate the new set up.


Where is that emoji for a solar powered submarine when you need it ?
Sand space – admin theme for Textpattern
phiw13 on Codeberg

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