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Mailu

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Discussion about the Mailu mail server distribution https://mailu.io - feel free to ask for user support in this room -- See #mailu-dev:tedomum.net for dev discussions on the main project -- See #mailu-helm-chart:make-it.fr for dev discussions on the mailu kubernetes project -- Project-Meeting-Notes: https://github.com/Mailu/Mailu/issues/1582181 Servers

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21 May 2024
@audioscavenger:matrix.orgEricRedacted or Malformed Event16:29:53
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@hakaga:matrix.orgHakaga joined the room.19:14:32
23 May 2024
@biolastic:matrix.orgAdministrator Biolastic joined the room.16:09:58
24 May 2024
@ex1c:matrix.orgJonas joined the room.11:12:54
@ex1c:matrix.orgJonasHi, I'm still having this issue: https://github.com/Mailu/Mailu/discussions/3180 and I'm not sure how to proceed further. I see in the smtp log, that something (client=unknown[192.168.203.1]) manages to create a connection to the smtp daemon and sends mail. I didn't find out yet where exactly it is coming from. Any ideas? Version is 2.0, did a docker-compose pull/restart yesterday.11:22:40
@neo:shdw.frHaley192.168.203.8 is a RFC 1918 IP which is not routed by the ISPs. So I suspect that you have wrongly configured your front proxy. Check what IP range your docker setup uses with: 'docker network list' then a 'docker network inspect <network>' where network is your mailu network name.12:05:10
@ex1c:matrix.orgJonasMhm, the front proxy uses the networks "default", "web" (for traefik) and "webmail". default is configured to use the subnet 192.168.203.0/24. Isn't the 192.168.203.8 just appearing because it's the smtpd (on the mailu default network) telling me that it wasn't able to deliver the message?12:24:40
@ex1c:matrix.orgJonas * Mhm, the front proxy uses the networks default, web (for traefik) and webmail. default is configured to use the subnet 192.168.203.0/24. Isn't the 192.168.203.8 just appearing because it's the smtpd (on the mailu default network) telling me that it wasn't able to deliver the message? 12:25:11
@ex1c:matrix.orgJonas * Mhm, the front proxy uses the networks default, web (for traefik) and webmail. default is configured to use the subnet 192.168.203.0/24. Isn't the 192.168.203.8 just appearing because it's the smtpd (on the mailu default network) telling me that it wasn't able to deliver the message? 12:25:24
@rustbuckett:matrix.orgrustbuckettHow can I open port 25 to external access so that starttls will work? It's listed in the ports section of the docker-compose.yml and I've added iptables rules to accept connections to port 25 from the outside. I can connect to it via 'telnet localhost 25', but 'telnet example.com 25' times out. 'nmap -p 25 example.com' shows to port as filtered. 12:54:04
@neo:shdw.frHaleyThing is, that the front is not forwarding the real IP, hence all requests will show the 192.168.203.8 as that is the IP of the proxy.13:11:20
@neo:shdw.frHaleyIf the known subnets are 192.168.203.0/24 then all requests from anyone will go through. Go onto the internet and check your mail-server for open-relay 13:12:02
@ex1c:matrix.orgJonashttps://mxtoolbox.com shows all green except for reverse dns (is not a valid hostname, probably because it's missing a subdomain)14:44:14
@ex1c:matrix.orgJonashttps://tools.appriver.com/OpenRelay.aspx is all green and http://www.aupads.org/cgi-bin/test-relay.cgi says All tests performed, no relays accepted by remote host.14:48:32
@ex1c:matrix.orgJonas * https://tools.appriver.com/OpenRelay.aspx is all green and http://www.aupads.org/test-relay.html says
All tests performed, no relays accepted by remote host.
14:49:45
@ex1c:matrix.orgJonasdid you specify your external IP in the port mapping?17:46:12
@rustbuckett:matrix.orgrustbuckettIn docker-compose.yml, yes.20:29:15
@rustbuckett:matrix.orgrustbuckettAfter some research, I suspect it's some filtering done at my VPS provider. I currently working with them to research it.20:30:52
26 May 2024
@dippa:matrix.orgdippa joined the room.09:56:59
@dippa:matrix.orgdippa

Hi, I'm having a hard time sending emails reliably. I'm using Supabase's SMTP to send emails on port 465 (because I seem to be too stupid to get 587 to work). It's especially the icloud and gmail mails that cause trouble, although not always. Some users get them, and for some I get an undelivered error in my inbox. Here is an example:

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system

<gists-corneal-0a@icloud.com>: 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)
Reporting-MTA: dns; my.app
X-Postfix-Queue-ID: CCA2C166A50
X-Postfix-Sender: rfc822; register@my.app
Arrival-Date: Sun, 26 May 2024 10:00:11 +0000 (UTC)

Final-Recipient: rfc822; gists-corneal-0a@icloud.com
Original-Recipient: rfc822;gists-corneal-0a@icloud.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; mx01.mail.icloud.com
Diagnostic-Code: smtp; 554 5.7.1 [HM08] Message rejected due to local policy.
   Please visit https://support.apple.com/en-us/HT204137

I've read the apple support page, but that didn't help me much.
Is this because I am on port 465? Any other ideas?

Thanks :)

10:09:02
@rustbuckett:matrix.orgrustbuckettAfter further research and working with my VPS provider, I learned that Comcast filters port 25. 11:03:30
@rustbuckett:matrix.orgrustbuckett
In reply to @dippa:matrix.org

Hi, I'm having a hard time sending emails reliably. I'm using Supabase's SMTP to send emails on port 465 (because I seem to be too stupid to get 587 to work). It's especially the icloud and gmail mails that cause trouble, although not always. Some users get them, and for some I get an undelivered error in my inbox. Here is an example:

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system

<gists-corneal-0a@icloud.com>: 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)
Reporting-MTA: dns; my.app
X-Postfix-Queue-ID: CCA2C166A50
X-Postfix-Sender: rfc822; register@my.app
Arrival-Date: Sun, 26 May 2024 10:00:11 +0000 (UTC)

Final-Recipient: rfc822; gists-corneal-0a@icloud.com
Original-Recipient: rfc822;gists-corneal-0a@icloud.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; mx01.mail.icloud.com
Diagnostic-Code: smtp; 554 5.7.1 [HM08] Message rejected due to local policy.
   Please visit https://support.apple.com/en-us/HT204137

I've read the apple support page, but that didn't help me much.
Is this because I am on port 465? Any other ideas?

Thanks :)

I don't think it has to do with the port that you're using. I had a hell of a time getting emails to send reliably to Apple, Gmail, and Outlook addresses. Make sure that you have all of the DKIM, SPF, DMARC and everything set up. Also, use mxtoolbox.com to check everything. WIth mxtoolbox.com, I discovered that my IP was on one obscure blacklist from 15 years ago, which was a full decade before I controlled the IP, but it caused outlook.com to reject my emails.
11:08:09
@rustbuckett:matrix.orgrustbuckett How do I regenerate my server certificates? I recently started having trouble receiving emails from Protonmail. This is the first time I've had trouble with another email provider refusing to deliver email to me. Historically, it's been the other way around. When I try to send mail from Protonmail to my Mailu server, it doesn't go through and I get a delayed mail message 12 hours later that contains the cryptic message "server certificate not trusted". I've checked the cert with openssl s_client -connect mail.example.com:465 -verify 5 and it looked like everything came back fine. Also, I'm able to send email from the Mailu server to Protonmail just fine, but a reply won't go through. Super weird. 11:14:45
@dippa:matrix.orgdippathanks, I've had many DNS entries missing. It seems to work now :)11:31:58
@afoywdgu:matrix.orgafoywdgu joined the room.14:50:39

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