Think as well about the kinds of metrics you're evaluating. You probably know that interaction with email campaigns is measured through open and click-through rates. While it's meaningful to review email response in this way, if this is all you measure, you're missing the bigger picture of the value of email to your company and its customers. These rich metrics in the email are great. However, there is a distinction must be made between:
People buy when they feel that they have good reasons to do so. So, you need a strong value proposition (=great reasons for buying what you sell). If you don’t have it, you can’t be able to give people good reasons for buying. If you don’t know what—specifically—would make people see value in your offer, how could your email marketing (or any marketing) be effective?
That is why you need to carefully check the reputation of the vendor(s) and constantly track each campaign. ClickMeter provides you with relevant tools to manage and track solo ads campaigns: real-time and reliable tracking, advanced redirection options (including affiliate link cloaking), destination URL monitoring and click-fraud detection. More info here: https://clickmeter.xyz/track-solo-ads
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