Need help with invalid headers

[email protected] Wed, 27 May 2026 12:26:06 -0400
Newsgroups gmane.mail.imap.cyrus
Message-ID <[email protected]>
--17798991661.7cbA3.1040
Date: Wed, 27 May 2026 12:26:06 -0400
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Hello,

I need some help please.
I've been running cyrus imapd on ubuntu since ages, using thunderbird clien=
ts (on windows), moving incoming pop3 messages (local) from the mbox onto t=
he imap server.
Now, apparently since last december, I get an error message saying, the com=
mand failed because the message contains invalid headers. I did an upgrade =
some time ago, could hgave been in december, but honestly I don't remember.=
 Now I'm running 3.4.3 (ubuntu jammy)
I've figured this would be a ">From " line in the headers. Manually deletin=
g these fixes the problem.
However I checked and this line was in all messages before december as well=
, causing no issues.
So I think, this must be something in the upgraded cyrus imapd version, tha=
t wasn't there before and it accepted the ">From " headers.
But I don't find an option in cyrus to ignore these headers or anything. I'=
m not even sure what's the proper header, isn't it "From: "?

Anyway, I'm confused what's causing this or how to fix. Apparently not a Th=
underbird issue as it was doing it since many years. Any help, please?
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Date: Wed, 27 May 2026 12:26:06 -0400
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<!DOCTYPE html>
<html><html><html><body><div>Hello,<br /></div><div><br /></div><div>I need=
 some help please.<br /></div><div>I&#39;ve been running cyrus imapd on ubu=
ntu since ages, using thunderbird clients (on windows), moving incoming pop=
3 messages (local) from the mbox onto the imap server.<br /></div><div>Now,=
 apparently since last december, I get an error message saying, the command=
 failed because the message contains invalid headers. I did an upgrade some=
 time ago, could hgave been in december, but honestly I don&#39;t remember.=
 Now I&#39;m running 3.4.3 (ubuntu jammy)</div><div>I&#39;ve figured this w=
ould be a &quot;&gt;From &quot; line in the headers. Manually deleting thes=
e fixes the problem.<br /></div><div>However I checked and this line was in=
 all messages before december as well, causing no issues.<br /></div><div>S=
o I think, this must be something in the upgraded cyrus imapd version, that=
 wasn&#39;t there before and it accepted the &quot;&gt;From &quot; headers.=
<br /></div><div>But I don&#39;t find an option in cyrus to ignore these he=
aders or anything. I&#39;m not even sure what&#39;s the proper header, isn&=
#39;t it &quot;From: &quot;?<br /></div><div><br /></div><div>Anyway, I&#39=
;m confused what&#39;s causing this or how to fix. Apparently not a Thunder=
bird issue as it was doing it since many years. Any help, please?</div><div=
 id=3D"topicbox-footer" style=3D"margin:10px 0 0;border-top:1px solid #ddd;=
border-color:rgba(0,0,0,.15);padding:7px 0;">

<strong><a href=3D"https://cyrus.topicbox.com/latest" style=3D"color:inheri=
t;text-decoration:none">Cyrus</a></strong>
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