As others have said. If low people have opened your campaign which you can spend a lot of time on, they will suspend your account and say you have to delete more than 60% of your contacts!!We moved all our mailchimp contacts over and they suspended my account during the Christmas period which could cost my business potentially £80000-£18000, Yes, that's thousands of pounds lost because of a suspended account .. They don't care as the customer service agent said, can't do anything about it.. ?!No refunds offered for their rubbish service. They are quick to respond to the first message, but slow to respond to a follow up. And We are a multi-award winning company winning awards over the last 5 years! And we cannot believe the rubbish we have recently read. We have since unsubscribed after their last email!! Not a professional service. They are not taking another penny of us!Originally I had 2 thousand emails blocked and suspended, they told me to go through the very long winded and time consuming process of deleting all the blocked emails line by line,... and then reinstalling them.. (Took us 3 hours!!!) and then they all got suspended and blocked again!!!We've had no issues with mailchimp, so going back with them.Our mailing list was being held hostage, The Export of our contact list is unusable to transfer to another mailing list!!Edited, it's taken me about a week to re-transfer ALL the contacts off their system. I had a lot of Syntax errors in the files which we had to go through line by line, 5000 lines of contact!..Their Ad: Don't Let Them Overcharge YouBrevo 9000 Emails a month, Free — Stop Overpaying for Email and Get the Best Value in Email Delivery & Email Marketing Tools. Revolutionize your marketing efforts with powerful email automation and stunning templates. Terrible! we had to pay £16 per month (Excluding VAT), yeah, they don't tell you that up front!.. for just have 4000 emails which we cannot use anymore!Try to save some money, but ended up wasting a lot of man hours and monthly subscription fees