When you make a domain name sale, there is one thing that is pretty obvious.. they are a domain buyer! They may be an "end user", they may be a developer, marketing company or they simply may be a domain investor but they are a domain buyer. You may not realize it at the time of the sale but these contacts often can lead into more domain name sales for you down the road.
Keep the buyers contact information! This data just may become a long time buyer’s contact.
What should you save?
I save just about everything. If I get an email with interest into a specific domain but do not make a sale, I save the contact.
If I make a purchase from a seller, I save the contact information. Domain sellers are often domain buyers.
If I make a sale on a third party site like Sedo, Afternic, GoDaddy or SnapNames.. I wait a couple days after the transfer of the domain has taken place and I do a whois look-up to find out who the buyer was and grab their contact information if privacy is not in place.
Be sure to know what domain the buyer purchased, the price and any other helpful information you may need down the road. This can help you if you happen to be trying to sell a "similar domain" because they may be interested.
You really do not need some fancy software to save this data as you can simply make a folder in your email but a email marketing service program like iContact.com may greatly help you with this because overtime you will end up with a lot of contacts.
Didn’t Save Contacts?
Not that big of a deal because the good news is, you can start now!
A good way to get a jump start on this is to go back through some recent domain names you sold and start doing whois searches. Grab the data for the domain and save them as a contact.
Once you get in the habit of saving the contact information after a domain sale, it becomes second nature to keep doing it. Your list will likely grow pretty quickly based on contact interests, past domain sales and current domain sales.
It also doesn’t hurt to keep your eye on sales that have taken place recently with public reported domain sales at Sedo, DnJournal and NameBio.com. Clearly offering a domain name that may be considered "worse" than the one they just purchased and wouldn’t have marketing or traffic benefits to them isn’t always going to lead into a sale, so be smart about it.
Over Reaching!
I don’t mind an occasional off the wall email with somebody pitching a domain name to me but there are limits for just about anyone. Prices and quality of the domain name will almost always be the key factor! Sending too many emails may likely get the person to unsubscribe or ask to be removed. Some may ask to be removed right away, but at least you tried. Don’t be offended if somebody asks to be removed because it happens!


Kitvy
Yep, agree with you.
Consider it as long term business relation.