when trying to contact some site owner and I click on a link on his site which should open his mail program, I receive often the message
"could not perform this operation because the default mail client is not properlu installed"
Is something faulty in my computer or his?
what can be done?
please advise
thanks

Could depend on your e-mail program or his or their relationship.

Here is a quick Google might be worth browsing:

could not perform this operation because the default mail client is not properly installed - Google Search

What e-mail program are you using?

What e-mail program are you sending to?