[nzlug] (OT) Sorbs etc, was Exim: Limiting outgoing connections on Debian

[Shane]

On Tuesday 10 October 2006 23:30, Simon Lyall wrote:
> Greylisting like other other forms of spam filtering has false positives.
> People using it should be aware that activating it may result in legitimate
> emailing being:
>
> a. Delayed
> b. Being returned to the sender with an error
> c. Being lost with no error being generated to sender or receiver.
>
> Like other forms of spam filtering people may decide that these downsides
> are outweighed by the upsides. However they should remember:
>
> a. The above downsides *do* exist.
> b. Greylisting imposes load on the mail servers of senders.
> c. Greylisting is fairly simple for Spammers to beat and they will beat it
>    when it becomes worthwhile.

And I have in this mornings mailbox an example of the trouble some types of 
grey listing will cause.  A spammer has been using my "domain" as his for 
posting spam.
ie khgurh at weasel.is-a-geek.net
Someone has dropped me a mail this morning <auto-generated>, asking me to 
confirm I am that person, adding to *my* spam load
Spammer 2  Greylister 0 Innocent Party  (me) -1