[OT] Handling Returned Virus Mail
alex at tweedly.net
Sun Nov 27 18:25:02 CST 2005
Timothy Miller wrote:
> My ISP has installed a spam filter called "Vanquish" that works,
> well... perfectly.
> Vanquish doesn't attempt to filter by content, subject line or IP.
> Instead,legitimate senders not on my "allow" list get directed to a
> website where they have to type some graphic characters into a field.
> They only have to do it once. After that, they go on the allow list,
> unless I remove them. At first, I worried that legitimate senders
> would be put off. I've not heard a single complaint. The only comment
> has been, "Hey, where can I get this?"
> My outgoing email gets added to my allow list. Bonded senders are also
> allowed, unless I exclude them.
I've never tried any of these schemes, so I may be misunderstanding the
details, but ...
if you send a message which can't be delivered (e.g. you mistyped the
address, or your friend's email box is full, or their ISP is going out
of business, or .....) then you would normally get a message sent to you
to inform you of the non-delivery. These often come from some automated
address which won't accept incoming email. It looks to me as though
Vanquish will block them (ok, it will challenge them - but the automated
sender address won't deliver mail to a real person), and so you'll not
Similar issues should happen with problems on some mail lists, such as
emzlm, which warn you of delivery problems (e.g. including attachments
if not allowed, including html if not allowed, etc.) by sending an
automated email which won't get through.
Do you happen to know how it handles mail list (such as this one) which
show the individual senders in the "from" list (but I know I haven't
been challenged to get a message to you); does that mean it allows you
to whiltelist by "Reply-to" rather by "From" address ? And if so,
isn't that a way for spam to get in, since a spammer can spoof reply-to
addresses easily (assuming they have harvested email addresses from
specific mail lists) ?
Even worse, if you are on an emzlm mail list, and for some reason you're
ISP is bouncing messages temporarily, then you'll get a warning message
- but it comes from the mail list administrator, not the mail list
itself, and therefore may not get through.
(Or, in summary, I'm a bit skeptical about this overall approach :-)
Alex Tweedly http://www.tweedly.net
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.362 / Virus Database: 267.13.8/183 - Release Date: 25/11/2005
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