Gmail Tabs Not A Problem
I've recently set up a new email campaign in one of my niches and I signed up to it myself to check it all works (as I always do).
I'm using GetResponse by the way.
The first email went to my promotions tab, but all subsequent emails have gone straight to the primary tab.
I've heard it's the same when using Aweber.
So I'm now including an instruction on my thank you page (after people sign up to my newsletter) telling people that if they use Gmail they might need to check the promotions tab to get the email with the download link to my free report/ebook.
After that there should be no problem.
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Fire me a pm if you have a question. I build businesses and provide consulting. I do not do finance/money/internet marketing niches. Fitness, self-improvement and various others are welcome.