I have my own email server with a wildcard address (I still use gmail for anything that's actually important). I put certain addresses in shady forms a few times. I get a couple of spam messages per day to those addresses - always the same spam few spam campaigns. One is offering to sell me electric bicycles or partner with me to sell electric bicycles (didn't really pay attention) and more recently I started getting business proposal advance fee spam. The volume is pretty manageable and if I wanted, a pretty simple filter tuned for the spam I actually get would catch all of it and no ham.

I got spam to postmaster once for some reason. That's a nice way to make admins aware of your spam campaign.

Spam is presumably more of a problem when you're more well-known and you don't have the option to control your own filters.

I've just been the target of some spam "campaign" on my own email server. By the time I was annoyed enough to block some IPs and add a custom spamassassin rule for them, they had already stopped. It lasted two days.

Other than that it looks like I get like 4 spams per week.

Mind, i don't publish my email anywhere. If you look at my profile on here you'll get a gmail address.

Sorry, I should have been more specific. In Europe (or Germany at least) it’s required by law that you provide an imprint with contact information for every site you host, as well as a privacy policy that includes contact information of your GDPR officer if you collect any kind of personalized data. Since I’m a one-person company, that includes my personal phone number since I don’t have a business phone. Also chrome webstore for example requires a phone number if you host an extension on there.

Edit: Also this wasn’t about collecting phone numbers, but about providing one for your business if you host a publically accessible site

There are no occurrences of "cell" or "phone" in GDPR, and the only relevant occurrences of "number" are about "national identification numbers", which phone numbers are not.

In many EU countries, you can buy sim cards from some vending machine, in a grocery store or places where you can buy international telephone cards. No ID required. But phone plans are often tied to your home internet.

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