I have used this service for mailing out our catalogues to over 200 customers in one go with no problems at all so far! It's super easy, quick & affordable way if you are looking into bulk emailing through MailChimp or Aweber (or similar). The customer support is also very helpful - they will try their best when your account has been suspended due to spam complaints from other users/customers who receive emails that look like junk mails but actually contain promotional offers etc.. They'll do everything possible within reason just get them reinstated asap before it happens again because its annoying having an inactive mailbox which means people can't respond back via replies@zenmailer dot com.