shown in spam mail

i send email from asp to our customer with third party
tool.but in hotmail this mail shown in spam mail folder
but in yahoo shown in inbox folder.in mail i used three
links to our site one of them is mailto,
iwant to learn hotmail spam mail rules.what must i
consider when sending email

On Fri, 24 Sep 2004 02:22:28 -0700, "saato"
<anonymous@discussions.microsoft.com> wrote:

>i send email from asp to our customer with third party
>tool.but in hotmail this mail shown in spam mail folder
>but in yahoo shown in inbox folder.in mail i used three
>links to our site one of them is mailto,
>iwant to learn hotmail spam mail rules.what must i
>consider when sending email

One thing Hotmail considers as potential spam is mail from dynamic IP
addresses or addresses without reverse DNS.  These are common issues
for many users.  Beyond that, check with Hotmail and see what they
determine spam based on.

Jeff