Jeremy Visser <[email protected]> writes:
> On 06/06/10 20:10, Erik de Castro Lopo wrote:
>> If I send email from a gmail account with the word 'casino' in the
>> subject line, the email is rejected and the gmail account gets a
>> 'Delivery Status Notification' message.
>>
>> However, even with all the above, I'm still getting emails with
>> 'casino' in the subject line.
>>
>> Anybody have any idea why PCRE is only working with postfix some
>> of the time?
>
> I have never set up Postfix filtering before, so this is probably a
> stupid question, but is it possible the rules you added are only
> matching when sent with your e-mail address in the “To:” header (rather
> than the “Delivered-To:” header)?
They are not in either: the {header,body}_checks in Postfix are very blunt
tools, inside the MTA.
[...]
> Sorry in advance if I’m sending you on a wild goose chase.
It might have helped if you had a better understanding of the tool you were
giving advice about...
> Other things you could try is piping the mail through a hex editor to see if
> there are any funny U+0000 characters lurking in there.
...and possibly about the data transfer formats, too, since this is extremely
unlikely: having a NUL byte embedded in the word would, y'know, show up (and
the U+0000 notation means "the Unicode code point with the 16-bit value 0.")
I suspect you actually meant "check if the data is encoding in UCS2/UTF16", in
which you would see ASCII characters as a series of regular characters
separated by NUL bytes, because it is a 16-bit[1] encoding of Unicode.
...which you wouldn't try and transit through an email system even if it /was/
8-bit clean, which most of them are not.
Daniel
Footnotes:
[1] ...more or less, leaving aside the complications of the variable width
encoding used.
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✣ Daniel Pittman ✉ [email protected] ☎ +61 401 155 707
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