Are they promising to pay 50K for your domain? Wasn't it via GoDaddy contact form?
If so, it is a scam (appraisal certificates scam). Search in the forum, there are a lot of similar threads.
"Vangus" in .co.il may be a legitimate business, but they did not contact you. Somebody else did.
Because of this scam, GoDaddy now adds a lot of warnings to emails they forward:
We're required by ICANN regulations to forward these types of requests to you, and you're not under any obligation to respond.
Remember, we have no information on the legitimacy of these contacts, and scammers have been known to try to pose as GoDaddy or other companies. Use caution when viewing or replying to unsolicited messages from third parties. If you determine you would like to respond to this message, please be aware that you are electing to respond directly to a third party that has no affiliation with GoDaddy.