My name is Lilith, I'm on the Social Care team at Shopify.
The situation you're describing is likely related to one of 3 scenarios shown below:
This screenshot is from the Shopify Email help center guide for setup. Have you had the opportunity to go through those 3 reasons and tried to follow the advice in those?
The error isn't related to your browser or your domain being disconnected. It's likely the email address you entered in the field here:
If one of the 3 scenarios applies to your email address here, you'll want to make sure to correct that. To recap here are the reasons why you may be seeing this error regarding your sender email address:
1. You're not using a custom email using your custom domain
2. Your address is DMARC protected (more information in the guide above)
3. Your domain hasn't been authenticated/verified for the Shopify Email App
When it says it won't show up in the customer's inbox the way that you entered it into the settings, it means that the From section of the email will show up differently than what you inputted. Here's where the customer will see this difference:
Once you get your sender email sorted there, I highly recommend taking a look at email marketing funnels. This is going to be an incredibly useful way to convert more customers in the long run by nurturing the subscribers you have. This is a super cost-effective way to increase profits since you won't be spending as much from your marketing budget to acquire new customers.
Subscribers and previous customers are more likely to convert in comparison to those who are brand new and never seen your store before. Take a look at this email marketing course we offer for free. It'll have some helpful information to get you prepared for a long-term email strategy.
Let me know how you do with the information above! I'm happy to answer any questions you think of as you work on your business.