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  • From: "Stefan Hornburg (Racke)" <address@concealed>
  • To: address@concealed
  • Subject: Re: [sympa-users] Bad message caused Sympa crash
  • Date: Tue, 22 Feb 2022 07:24:33 +0100

On 21/02/2022 14:40, Silvers, Tim wrote:
Hi. We recently experienced a Sympa service crash due to receiving a bad
message. It appears to have been generated by from iPhone by a user
initiating Apple’s safe unsubscribe feature, as indicated by the header and
the body content [1].

The email was removed from the spool and Sympa was able to be started. Before
removing the email, Sympa would simply silently fail to start, but there were
errors in the logs (see attached) and in the journalctl output. It was just
odd that SystemD in our CentOS 7 install didn’t indicate a failure.

Anyway, I am providing these details because these “safe unsubscribe”
features are more pervasive now in many clients and I wonder if others have
experienced any issues due to these unsubscribe requests, and whether this is
something Sympa can address? It’s probably more of a fault of the clients
sending these and hitting mailing list services that handle unsubscribe
requests differently, so more of a client issue than a Sympa issue. But I
honestly don’t know why this message would crash Sympa. I will say that I can
open the email in Apple’s Mail client on my Mac, but Outlook crashes each
time I try to open it. Also, the email was sent to the service address with
no command. I thought Apple’s client might have attempted to send to the
listname-unsubscribe@domain address to request removal, as it is in the
headers of emails sent from Sympa, but alas, it did not.

An interesting issue, for sure.

[1] X-Mailer: iPhone Mail (19C63)

Apple Mail sent this email to unsubscribe from the message =E2=80=9CFresh Eg=

gs for Sale=E2=80=9D.=

It would be useful to see the crash error messages from the Sympa log ...


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