[sokoloff]

Who is to say that you have their email address? Even if you do, who is to say that the mail you're asking is going to come from that email address?

[getpost]

Exactly! I meet someone and they ask for info. I offer to email them with the info. I get their card and they don’t ask for my email address. I’m speaking from experience.

Even if they have my address, how soon is it whitelisted? Like, they run home and update their whitelist?

In at least one case, I suspect this set up is narcissistic. ‘People have to kow-tow to communicate with me.’

[glitchc]

Next time, write your email address on their card and give it back to them. If they really care about the information, they will follow up.

You shouldn't bother writing unsolicited emails with your advice to people who may not care. It's a waste of your valuable time.