On 2020-03-17 20:13, Andrea Venturoli wrote:
On 2020-03-17 15:52, Andrea Venturoli wrote:
Also,
https://www.cyrusimap.org/imap/reference/manpages/configs/imapd.conf.html#std:cyrusman-imapd.conf(5),
says "reject8bit: 0" is the default.
From this I understand my setup should NOT reject 8bit headers (but
change non-ASCII characters to X).
I'm now setting this explicitly and I'll see what happens.
In fact, nothing changed.
So, I made some tests.
I prepared a text file with the following content (notice the non-ASCII
character at the end of the Subject) and saved it as mail.txt:
Subject: Provaà
.
"file mail.txt" says "mail.txt: UTF-8 Unicode text".
Then I pushed this to my mailserver with curl:
curl --url 'smtp://myserver:25' --mail-from 'ml@xxxxxxxxxxx' --mail-rcpt 'ml@xxxxxxxxxxx' --upload-file mail.txt
With "reject8bit: yes", sendmail refuses the message with "Message
contains non-ASCII characters in headers". (Still don't know why it
doesn't refuse it upfront, but bounces it!).
With "reject8bit: no", I get the message and the subject is translated
to "ProvaXX", as I would expect, since rfc2047_utf8 is, by default, off.
Strangely, if I enable rfc2047_utf8, I still get "ProvaXX" as a subject.
In any case, it seems that, at least for the subject, UTF-8 characters
are handled (almost) as expected.
*HOWEVER* curl does not use UTF8SMTPS, which is instead activated when I
get mails that are bounced.
Any idea for a similar tool which can use UTF8SMTPS, so I can repeat
that tests?
bye & Thanks
av.
P.S.
I also tried tcpdump to get full data on a troublesome mail, but,
unfortunately TLS was enabled and I was not able to get clear data.
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