I have received an e-mail form a recruiter regarding a conference.
Jane Doe, Recruiter
Isn't it too personal for an e-mail with business connotation?
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It depends on the nature of the business relationship. If you know the person yourself, and have dealt with and worked with them, then there is an element of a personal business relationship, in which cases, I would consider it acceptable. It is a friendly, but not intimate closing.
If it is an impersonal relationship - they are after your organisation, or it is a cold sales contact - then it is probably trying too hard, and it is inappropriate, I think. Or it is trying to be personal, when it isn't.
But emails are a very difficult area to judge correctly, as a new form of communications that do not lend themselves to the formality of letters, but are not always as intimate as they sometimes seem. I have had "warm wishes" from recruiters when I have spoken to them and worked with them for a while. I do not have a problem with it in this sort of context.