As a general rule, I'd be careful giving out a personal email anywhere online (unless you fully understand the consequences, like if you know the reputation of the company or individual).

Personally, I opened a "SPAM" email account, an account that I just use for online sign-ups, like job search sites. That way, if that email account gets inundated by SPAM, it doesn't bother my personal email.

Also, another source of spam is from bots grabbing your email off of websites. Never post your email outright on a website if you don't want spam. Use a contact form or something similar.

Also wanted to add in there, that google mail, most commonly referred to as gmail is a superb source for a lot of spammers. While looking online for work, I've seen hundreds of e-mail accounts that are gmail accounts. And without fail, EVERY single one of those accounts has an auto reply when sends you to a link for signing up for a work program. This actually may not be considered spam, but I'm getting to that. Because you follow the link and sign up thinking it's some kind of application process, you then get spammed by a host of other gmail accounts. A large portion of these will capitalize the last name. Such as Joe SMITH. These are spam bots, and they all have unique accounts, so you can mark these as spam, but the new address is generated and it starts over again. Beware. Just a friendly hint.