Wietse Venema:
> Luca Fornasari:
>> I have an old Postfix 2.3.3 installation where the built-in MIME
>> parser is modifying (adjust) wrongly formatted MIME messages while
>> relaying them.
>>
>> This is not happening on a newer Postfix 2.6.6 installation and I
>> can't find any configuration parameter to restore the old behavior (as
>> I did for the missing headers).
>
> If the problem is with email addresses in message headers, you could
> try setting local_header_rewrite_clients=static:all. Otherwise, you
> could use header_checks to "fix" malformed headers.
The problem is with missing blank line between MIME boundary and
content in the body of the email i.e.
--=boundary1=
Content-type: multipart/related; boundary="=boundary2="
--=boundary2=
Content-type: text/html;charset="iso-8859-1"
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
Segue tabella HTML
<TABLE>
<TR><TD>1A</TD><TD>1B</TD><TD>1C</TD></TR>
<TR><TD>2A</TD><TD>2B</TD><TD>2C</TD></TR>
[...]
In Postfix 2.3.3 the missing blank line was inserted while in Postfix
2.6.6 it is not.
While looking at the source code diffs of src/global/mime_state.c I see
* XXX We don't insert a blank line separator into attachments, to
* avoid breaking digital signatures. Postfix shall not do a
* worse mail delivery job than MTAs that can't even parse MIME.
[...]
* Sites concerned about MIME evasion can use a MIME normalizer.
* Postfix has a different mission.
Can you confirm this is the reason of the different behavior?
I agree the problem is not Postfix and the best solution is to
correctly format the email, anyway as I said it is not that easy.
I need a strong reason to convince the audience.
Thanks in advance
Luca
