New Mailster user please help

I just bought mailster and I am confused at which mailing company to use with it and do I have to use an outside mailing company? The choices are amazon sws, mailgun and mail drill. Any recommendations?

Hi kmnutrition!

Thanks for your patience! We do hardly check the forums here!

We provide all of our official support via the member area on our website. If you have not done so yet, please use the link below to register for access so that you can post your question there: https://mailster.co/support/

We are looking forward helping you out.

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Dear Support, I have made mistakes and used an email which was not a registered email. When I was trying to validate my license, I got the error below:

Your purchase code is already in use and can only be used for one site.

I really appreciate your assistance in this matter