Thanks for the advise.
Yes, the mails are automatically created. Unfortunately, the software
that generates them are out of our control.
I supposed that it is a base64 code, but if I try to manually pass the
text into 'base64 -d' - nothing usable goes out (you can try yourself
with the first part of the mail I've posted). Maybe it is salted, but I
don't see how to decode it...
Peter
On 09/04/2024 16:15, Doug via dovecot wrote:
-----Original Message-----
From: Peter via dovecot <dovecot@dovecot.org>
Sent: Tuesday, April 9, 2024 5:18 AM
To: dovecot@dovecot.org
Subject: Strange problem with sieve
Hello,
I use Dovecot 2.3.20 on FreeBSD 13.2 (in jail) as a part of iRedMail
installation.
Some mailboxes are configured for automatic mails processing using sieve
(execute :pipe) and a custom binary (started by script). The system was
configured and was working correctly during several weeks.
Since ~10 days the system starts to work strangely. _*/Some/*_ mails
cannot be decoded anymore. No changes at our side, no updates etc.
I dumped the content received by my binary, and it looks really strange:
pOUc9Z33O0GbfzbW5Mrmi
3L4tTlvKfsD8wP+hc6vN1v1bv+Vx827kW+YX5n/Zxtl240erH4t+nNyeuL1zh92
O0p24nYKd
vbtcd1UVyBdkFwztDtrdsIexJ2/Pu71L914vnFdYto+0T7JvoCiwqGm/7v6d+78U
Jxf3lHiU
1B9QO7D1wIeD3IO3S91K68rUy/LLPv/E/6m/3Le8oUK/ovAQ7lDWoaeHow6
3/8z8ubpStTK/
This is a start of one mail. No headers, no readable data.
I removed "discard;" from sieve script to put such mails in the mailbox,
and the mails look normally:
Mime-Version:1.0
Content-Type:multipart/mixed; boundary="=-/3n/zeVGlN5thgeL28RKiw=="
--=-/3n/zeVGlN5thgeL28RKiw==
Content-Type: multipart/alternative; boundary="=-
sE/MdvfJZlakBmrKkcdzCg=="
--=-sE/MdvfJZlakBmrKkcdzCg==
Content-Type: multipart/related; boundary="=-cgJVnLNlzX5YuD6yaI5USQ=="
--=-cgJVnLNlzX5YuD6yaI5USQ==
Content-Transfer-Encoding: base64
Content-Type: text/html; charset=utf-8
etc.
Really, I have no idea about any direction to explore. The server is
totally under my control, I can do anything, but I have no idea how to
debug this situation.
I tried to redirect such mails to another mailbox and process them
there, but I get the same strange data. If I connect Thunderbird to the
mailbox - I can read the mails correctly. So, the problem arrives at the
moment when the sieve system is invoked - the mail data is corrupted
somehow.
Any advise will be really appreciated.
Peter
RE:
--=-cgJVnLNlzX5YuD6yaI5USQ==
Content-Transfer-Encoding: base64
What has changed is the body content of incoming emails is now base64 encoded.
Because you are trying to process these messages with a script, I'm going to
guess that the emails in question are automatically generated somewhere. Go
back to the process that is creating these emails and disable base64 encoding.
Or, add a base64 decode step to the sieve execute script.
Doug
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