Look at their work history, read what they are actually writing. If they are specific about the role, the company and why you fit, they are probably good. If there is a list of qualifications and no real reasoning as to why they are contacting you specifically, they probably aren't very good.
I said this in another post, but even as a recruiter, I get contacted constantly and I usually just look at the persons work history, the specifics of the offer, if they actually seem credible, (does person offering you job at Google actually work at Google?) and if they're offering something that actually makes sense for you. If those are the case, they're probably not dreadful.
I said this in another post, but even as a recruiter, I get contacted constantly and I usually just look at the persons work history, the specifics of the offer, if they actually seem credible, (does person offering you job at Google actually work at Google?) and if they're offering something that actually makes sense for you. If those are the case, they're probably not dreadful.