[Mailman-Users] Questions about Content Filtering
heller at deepsoft.com
Fri Aug 22 15:51:26 CEST 2014
At Wed, 20 Aug 2014 09:34:17 -0300 Nancy <cybergram at eastlink.ca> wrote:
> Hi folks, I am not very technically inclined and I'm the co- listkeeper for a group. We have had some problems lately and we were wondering
> what would happen if we made changes to the Content Filtering section of the Admin page?
> If :
> were removed would the listkeepers, as owners of the group receive bounces from everyone who tried to send formatted text?
> If these two lines were changed from "Yes" to "No" what would happen?
> Should Mailman collapse multipart/alternative to its first part content? No Yes X<http://lists.oso-aa.org/mailman/admin/grow/?VARHELP=contentfilter/collapse_alternatives>
> Should Mailman convert text/html parts to plain text? This conversion happens after MIME attachments have been stripped. No Yes X
The *best* option would be to:
1) reject (or moderate) 'pure' HTML messages.
2) Strip text/HTML parts off.
Most (all?) *decent* E-Mail clients send both a text/plain and a text/HTML
version of the message (multipart/alternative). Generally, the text/plain
is 'sufficient' -- it contains the *text* of the message, without the
(unnecessary!) formatting (eg fonts, colors, etc.). *Some* mailers deal
with 'bold' using old-school ASCII tricks (like *this is bold*).
Unfortunately, many mailers / computers (including cell phones and tablets),
use non-ASCII character sets (not that they need them really, esp. for
*American* English), so lots of 'common' characters like quote marks,
aposthophes, and some other puncuation characters show up as UTF-8 characters
that don't display well with 7-bit ASCII mailer programs.
> Examples of our current problem:
> 1.This Ã at the end of every sentence & inserted in several places in sentences:
> Louise can't get email.Ã
> 2. One continuous paragraph arrives when the sender had made appropriate paragraphs
Unfortunately, many modern E-Mail clients no longer insert line breaks and
expect the *receiving* E-Mail client to 'wrap' lines, depending on the display
width. There is not much you can do about this, other than rant at the E-Mail
client authors, who are not going to listen to you.
> 3. Complete gibberish:
> MLNÂ13:46 UTCâ4
> \Ã[Â]Z\ÂNÂÃ\ÂÂYHÃÛH\Ã\ÂÂYP at arthlink.net>
> ØÂ]ÂÂ°Ãª\ÂÃ[ÃÃYHÃÔÃÎ[\Ü\ÂHMentor hi from Jessi first nine days
> > Hi Sherrie
> Â Day 10 :)
> ÂFÂæ²Ã·RfÃ·"6ÂV6Â¶ÂÃ¦rÂÃ¢Ã¢ÃÃ·fRFÂRw&Ã·W. Reading the threads in my inbox every day <http://lists.oso-aa.org/mailman/admin/grow/?VARHELP=contentfilter/convert_html_to_plaintext>
> Are these problems caused by many people now using cell phones & tablets to send email?
> Thank you for your patience & any help you might provide.
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