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I have a list of 200 000 superscribes for a niche.

I was wondering what e-mail solution would allow me to import this list and send out e-mails.

Also my current e-mail address is a @yahoo.com. Will I be okay with using a yahoo e-mail or should I do something else ?

You can buy a bulk e-mail server and use any php script like Interspire E-mail Marketer (best) or PHP mailer to send E-mails.I can help you setting up these programs on server. Alternatively you can use Mailchimp (12,000 E-mail/Month) or Mailjet (6,000 Email/Month).

In any of the cases, your e-mail list must be opted-in, otherwise your server and ip will be ban or you may fall in trouble. Yahoo mail has some limit on bulk-email. If you send too much e-mail from yahoo, your account will suspend.

I have country wise targeted/non targeted e-mail list. If you want to exchange e-mail list or want to buy list from me, PM me.Thanks

you can't use yahoo to mail this number of users
you need your dedicated service for that task

check your PM