I’m highly amused at attempts I’ve seen in public forums to munge email addresses.
Spammers want your domain. Even script kiddies go further than a username@domain reference. A space between username @ domain.com is useless except to hassle anyone who wants to email you.
How do bots get addresses to spam you? From the domain, bots get your homepage, and from there they get real addresses, or they generate addresses like Sales@, WebMaster@, etc.. If you want to protect yourself from spam, never publish your raw domain name. The munge technique I use in public forums is to say:
TG @ remove.thisNebula-RnD.com
This thwarts silly first-attempt bots that scan for user@domain addresses (as if there are any of those anymore) but unless a person is looking at the address a program isn’t going to know where the domain name actually starts. Yes, the more sophisticated programs will scan from the .com and move forward until they get a good domain, but masking the domain name itself is only going to discourage legitimate visitors from your site, and there’s only so much you can do in this aspect of anti-spam warfare.
The unfortunate aspect of that technique is that people do need to copy just a part of your domain name. But they’ve got their finger on the copy/paste anyway, so you’re just asking someone to be more selective about what they copy. My opinion is that if someone isn’t smart enough to start copying after "remove.this" then they aren’t likely to understand my product or service offerings either, so I’m not losing anything. YMMV
If you are going to try to protect your email address with munging or even a simple "user @ domain", fergoshsakes, don’t subscribe to a public forum using your real full address. Even forum software like that used in Google Groups is completely naive to assume that it’s protecting anyone with "user-at-domain.com" For this reason I never post to forums with a real address. I use sneakemail.com where I can create a disposable email address. They pre-filter mail in various ways and spam hardly ever gets through. If an address gets compromised then just delete it and create new ones – and never again give your address to whomever compromised it.
To paraphrase Master Yoda: "Munge or do not."