Originally Posted by PowerCum

We have about 1500 unused domains here and there are several "sell me that domain" mails per week.

The rules for a non reply are very simple:

1 ) No offer in the mail = no reply
2 ) Ridiculous offer ($20 or $50) = no reply
3 ) A stupid mail like "Hey, what to sell? how much?" = no reply
4 ) No info about the buyer = no reply

These are made just to avoid useless waste of time.

Try sending a mail like this and you will probably get a reply relatively fast. If you get no reply, then send a mail offering $150k for the domain. You will see immediately if your mails go to the trash or your initial offer is just denied.

"Hello,

My name is X and I represent company Y. I am interested in purchasing example.com domain. At the moment would be happy to offer $123 for it.
Please, make me know if you are interested in selling it.

Regards
X"