If you go into your Manage + Track you'll see dots under the "EMAIL STATUS" column. Hover on those dots and you'll see if your email was delivered, opened, clicked on, etc.
Our email statistics are extremely reliable, so if the data says an email was delivered, it was delivered. But, we can't know *where* it was delivered within that email client.
The most likley case scenarios are:
1. Work Filters: Some work emails (like a law firm or a bank) might have very strict filters, so it's possible an email from an unknown source got flagged. In this case it may be best to re-send the invitation to a personal email.
2. Gmail Promotions: Some Gmail emails go into a "Promotions" tab. This is not the same as Spam/Junk, and this tab only shows up in a browser setting. So, let your guest know to check the Promotions folder. Please note that there is nothing we can do about this at the moment. We are a small business, so we can only fix this by growing and delivering more emails - this will allow the Google algorithm to know that our emails are not "Promotions".
3. User Error: Many people open emails without realizing, delete emails accidentally, or just have a hard time navigating and finding email. If the system says the email was delivered successfully, it's almost certain that it was.
We track our email reputation very closely and are at the highest level with all major email providers. Our deliverability rates are also consistent with that of the industry. If you were to send out 100 emails, it would be totally normal for about 70-90 people (on average) to find and open the email. Remember, email habits very wildly. Some people check email constantly, some check once a day and some check once a week (and some have 100,487 unopened emails).
As with any type if invitation, you will need to follow-up with a subset of your guests. You can do this personally, or use the "Follow Up" feature and send additional (free) reminder emails to the guests who have not yet opened the email or RSVP'd.