[GH-ISSUE #892] smtp Failed; 5.4.0 (other or undefined network or routing status) #629

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opened 2026-02-25 23:43:06 +03:00 by kerem · 4 comments

kerem commented

2026-02-25 23:43:06 +03:00

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Originally created by @odtgit on GitHub (Sep 13, 2023).
Original GitHub issue: https://github.com/healthchecks/healthchecks/issues/892

My smtp healtcheck has been failing for some 22 hours without any known configuration changes on my end. I use an ISP relay (mailout.telia.com) and it's returning now a mailer-daemon error. Just before I start looking at their support options, posting this issue to check if it might actually be some configuration change on hc-ping.com MX?

From: Mail Delivery Service MAILER-DAEMON@telia.com
Subject: Delivery Status Notification
To: ###
Date: Wed, 13 Sep 2023 14:25:43 +0200
Message-ID: 64171A4007A9F9E7@ts201-smtpout73.ddc.teliasonera.net
X-CP-Transaction-ID: 64171A4007A9F9E5
X-CP-For: ###@hc-ping.com
MIME-Version: 1.0
Content-Type: Multipart/Report; report-type=delivery-status; boundary="========/64171A4007A9F9E5/ts201-smtpout73.ddc.teliasonera.net"

--========/64171A4007A9F9E5/ts201-smtpout73.ddc.teliasonera.net
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

These recipients of your message have been processed by the mail server:
###@hc-ping.com; Failed; 5.4.0 (other or undefined network or routing status)

--========/64171A4007A9F9E5/ts201-smtpout73.ddc.teliasonera.net
Content-Type: Message/Delivery-Status

Originally created by @odtgit on GitHub (Sep 13, 2023). Original GitHub issue: https://github.com/healthchecks/healthchecks/issues/892 My smtp healtcheck has been failing for some 22 hours without any known configuration changes on my end. I use an ISP relay (mailout.telia.com) and it's returning now a mailer-daemon error. Just before I start looking at their support options, posting this issue to check if it might actually be some configuration change on hc-ping.com MX? From: Mail Delivery Service <MAILER-DAEMON@telia.com> Subject: Delivery Status Notification To: ### Date: Wed, 13 Sep 2023 14:25:43 +0200 Message-ID: <64171A4007A9F9E7@ts201-smtpout73.ddc.teliasonera.net> X-CP-Transaction-ID: 64171A4007A9F9E5 X-CP-For: ###@hc-ping.com MIME-Version: 1.0 Content-Type: Multipart/Report; report-type=delivery-status; boundary="========/64171A4007A9F9E5/ts201-smtpout73.ddc.teliasonera.net" --========/64171A4007A9F9E5/ts201-smtpout73.ddc.teliasonera.net Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit - These recipients of your message have been processed by the mail server: ###@hc-ping.com; Failed; 5.4.0 (other or undefined network or routing status) --========/64171A4007A9F9E5/ts201-smtpout73.ddc.teliasonera.net Content-Type: Message/Delivery-Status

kerem closed this issue

2026-02-25 23:43:06 +03:00

kerem commented

2026-02-25 23:43:06 +03:00

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@cuu508 commented on GitHub (Sep 13, 2023):

Yes, I've made several changes to the SMTP service recently:

The SMTP service now suports STARTTLS (but still allows unencrypted communication as before)
I removed DNS MX records for the hc-ping.com domain.

From the bounce message it is not clear which change is the culprit and why.

FWIW I've tested email delivery from Gmail and Fastmail.

@cuu508 commented on GitHub (Sep 13, 2023): Yes, I've made several changes to the SMTP service recently: * The SMTP service now suports STARTTLS (but still allows unencrypted communication as before) * I removed DNS MX records for the hc-ping.com domain. From the bounce message it is not clear which change is the culprit and why. FWIW I've tested email delivery from Gmail and Fastmail.

kerem commented

2026-02-25 23:43:06 +03:00

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@odtgit commented on GitHub (Sep 13, 2023):

Thanks for the info, changed to use gmail relay for now.

@odtgit commented on GitHub (Sep 13, 2023): Thanks for the info, changed to use gmail relay for now.

kerem commented

2026-02-25 23:43:06 +03:00

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@MichealCodez commented on GitHub (Sep 19, 2023):

I was having issues like this with gmail until I setup my gmail (Delivery mail) to use token instead of password

@MichealCodez commented on GitHub (Sep 19, 2023): I was having issues like this with gmail until I setup my gmail (Delivery mail) to use token instead of password

kerem commented

2026-02-25 23:43:06 +03:00

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@cuu508 commented on GitHub (Sep 19, 2023):

@MichealDavid1 this issue is about a previously known good and working setup breaking on September 12, due to changes on hc-ping.com side (added STARTTLS support, removed MX records). Did you also have a working setup that broke around September 12? If not, you are probably describing a separate issue.

@cuu508 commented on GitHub (Sep 19, 2023): @MichealDavid1 this issue is about a previously known good and working setup breaking on September 12, due to changes on hc-ping.com side (added STARTTLS support, removed MX records). Did you also have a working setup that broke around September 12? If not, you are probably describing a separate issue.