You may be wondering what does this have to do with Domain Name. You sold a domain and transfered the ownership, what does after sales service have to do with this ?
Well any successful business needs loyal customers who come back in future for more products. Every customer who buys your domain , is a future prospect for more domains. The idea is to have list of customers whom you can contact if you want to sell similar names, and if you provide a good after sales service you increase you chances of selling more domains.
So what after sales service can you provide.
The above is just a glimpse of what you can do as a part of after sale service. The idea is to think long term with everyone you deal with. Domaining is a small world and you are likely to sell more domains if you have great relations with others.
But keep this as a surprize!. Buyer should be excited about this whole process.