CFMail breaks up attachments filename with non ASCII

Question

Hi CF-Devs out there!
My problem is, that when attaching files via cfmailparam - no
matter if inline or not - and using a filename that contains or a
non 7bit-ASCII character or a simple space, the filename is not
displayed correctly in Outlook nor Thunderbird. I am sure that this
topic has been discussed here earlier but I really don't find any
topic when using the Forum Search function... so please help anyway
:) I am still using CFMX 6.1 :(
My code is the following:
<cfmailparam type="#variables.attachments
.getContentType()#"
file="#variables.attachments.getFilename()#"
disposition="#this.dispositionType(variables.attachments
.isInline())#"
contentID = "#variables.attachments.getCid()#">
When I revise the generated email code then I find the
following:
Content-Type: application/octet-stream
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename*2=nger.csv;
filename*0*=UTF-8''emailempf; filename*1*=%c3%a4
Content-ID: <DEE13419-D022-9396-C8A4DF2AAAA7C4EF>
You can see that the filename (emailempfänger.csv)
breaks up into several pieces which according to
RFC 2231 is a
valid format but obviously is not interpreted correctly by e.g.
Outlook. Or am I missing something else?
I would appreciate your help. Thanks in advance.
Buergermeister

Answer 1

The filename you used does not contain any non 7bit ASCII
character. The problem only occurs if I use characters like
"ä","ö","ü" but even [space] does provoke the error.
The variables hold the following values (you can see them in
the source posted, too):
1) variables.attachments.getContentType() :
application/octet-stream
2) variables.attachments.getFilename() :
[AbsoluteFilePath]/emailempfänger.csv
3) this.dispositionType(variables.attachments.isInline()) :
attachment
4) variables.attachments.getCid():
DEE13419-D022-9396-C8A4DF2AAAA7C4EF
Cheers!