lynx-dev Re: LYNX-DEV Unsubscribed posting

[David Woolley]

> 
> The attached shows that mail.sig.net is rejecting postings from specific
> addresses, or accepting from only certain addresses.
> 
> Content-Transfer-Encoding: BASE64

Oops.  I'm not going to decode it just for this...

However the message indicated a reasonable anti-spam measure to reject
mail from addresses with no name in the DNS.  These are typical of
spam sending site, and otherwise indicate poorly run sites.
Every IP address used on the internet really ought to have an in-addr.arpa.
entry.  Moreover this should translate to a name which has an A record pointing
to the address; failure to meet this condition will cause TCP Wrappers to
reject you, when in paranoid mode.

Spammers without in-addr.arpa particularly annoy me, because I have to do
an online trace, often degenerating to a slow traceroute, to find a 
responsible ISP on their supplier chain.

Many FTP sites, will reject traffic under these conditions as well.