What To Do If You Are Banned or Suspended by Email Service Provider Such As MailChimp, Constant Contact, Aweber, GetResponse or Other
An email service provider such as Constant Contact, MailChimp, GetResponse, or Aweber can serve well email marketers who want the sending process and all subsequent things such as bounce, unsubscribe, and complaint processing to be carried out by the 3rd party.
But you should be aware that while providing high deliverability, email service providers have strict terms and conditions. If you violate their terms and conditions, they will suspend your account and you may never be able to re-subscribe even if you use a different email address.