Firstly make sure everything is set up correctly as explained in the video below.
Secondly, please don't test using repeated submissions from the same internet browser and generally your own tests will be the most unreliable, especially if you've tested more than once and you've also made changes to the lead collection page because the caching of that page, will affect the data that's collected.
Basically, it doesn't like data to be submitted multiple times from the same computer and that will affect what data is collected.
Thirdly, spam filters have become increasingly aggressive, so it is more and more common for emails to fall foul of the filter, wherever they've been sent from.
Here's a few tips to help ensure your emails get through:
Ask people to whitelist your email address and then make sure you always use the same 'from' email address in your emails (this process is different for each different email inbox)
Where possible, try and use a personal 'sent from' email address rather than a generic info@ or help@
Proof read the emails and make sure there aren't spelling mistakes in there (as this can be a flag to spam filters)
Make sure your subject line doesn't sound spammy ie. it doesn't mention words like free
The best email marketing software providers will also have features built in to help you avoid other common spam triggers such as not including a physical address, using a sending email address that looks suspicious and investing in registering the IP addresses of servers to demonstrate email compliance. However hard we try, we will never be able to invest the same kind of money or achieve the same levels of deliverability as a dedicated email marketing platform.
The best advice would be to use our integration with Mailchimp (which is a dedicated, well-established email marketing platform) to set up autoresponders when new people join your campaigns, from with Mailchimp. You can find some help videos showing how to do this at this link.