If you have 2000 subscribers only. You can continue with them. Mailchimp is good for you as a starter.

But, if you want no cap on your subscriber then you can go with SwipeMail.iohttp://swipemail.io/pricing/?utm_campaign=ab-nairaland&utm_medium=ab-nairaland&utm_source=ab-nairaland

SwipeMail: A cloud based platform for bulk email delivery. SwipeMail have built their own i-MTA (An AI driven Mail Transferring Agent) which keeps itself updated with the recent ISP's anti-spam policies, user's online behavior across internet and enables smart delivery for your emails.

SwipeMail (swipemail.io) is fastest growing ESP of the globe with Industry leading delivery rate.

- Cheapest - Price is almost 75% less than other global ESP’s like MailChimp, Aweber, ConstantContact etc.
- Fastest - Using high end server and IP pool with 95%+ reputation each IP, leads to 99% email delivery.
- Simplest - This is most easy interface to use with all the Advanced Automated features.

They are also providing online demo to explore the the features efficiently. Also they have 24X7 Premium support via- chat, mail.

Send Unlimited Marking/Promotional Emails from SwipeMail at just $20/Month..