Spammable

...such as finding people to cold-call and prospecting for spammable addresses.

Source: wiktionary

This can be done in many ways, which we look at shortly. Once you know it is spammable, you just need to know exploit ^([sic]) the system.

Source: wiktionary

He didn't recognize the sender, but this was a very secure, non-spammable address. The subject line simply said MESSAGE.HTML. He clicked on the blue text...

Source: wiktionary

But now software vulnerabilities — as with stolen credit-card numbers and spammable e-mail addresses — carry real financial value.

Source: wiktionary