Blasting 500 emails via Gmail using Blind Copy is better than sending an email where everybody sees each other emails, which in turn will make hell fall over you.
But much better is using Free Lite Edition http://group-mail.com/email-marketing-software-features/ which will blast, in automatic mode, 100 emails per single shot in a very individual and personalized form, including your attached resume.
When you send a blast in blind copy mode it does not produce the same impact as when you receive a single email person to person. You feel you are talking to just one person, not being the target of a Blast.
Regards, https://steemit.com/@justinomora