
Industry-leading inbox placement testing
See where your emails will land – before you hit send
Once you hit send, do you know where your emails land? How many went to the spam folder? How many went to the inbox? Did some land in the promotions or social tab? Don’t leave it to chance! Different mailbox service providers use different spam engines, which may cause emails to go to the inbox for some addresses and spam for others.
With inbox placement testing, you can proactively test where your emails will land at major mailbox service providers before you send.
Actionable insight
Identify and fix email deliverability issues
Identifying a spam issue is important, but so is knowing why your emails are landing in the spam folder. Factors like email content, spam trigger words, email header errors, and your email sender reputation can all affect inbox placement.
With inbox placement testing, identify and diagnose a wide variety of deliverability issues:
Detailed header analysis
Unique content scoring[NH1]
Suspicious attachments
Authentication checks
Our deliverability experts will help you determine why your mail is not getting to the inbox at both an aggregate and more granular level and broken down by major mailbox providers. We’ll guide you through resolving the issue, as there are nuances to deliverability specific to each mailbox provider.


Email authentication
Ensure proper email authentication
Setting up proper email authentication and BIMI is an essential part of managing a secure, high-performing email program. No matter if you're a first-timer or seasoned vet, it can be hard to get visibility into the status of your authentication.
Use inbox placement testing to see if you have configured DKIM, SPF, and DMARC correctly with insight into the pass/fail status of your email at the aggregate level as well as the mailbox provider level.
Comprehensive testing
Access the data you need to iterate and optimize
Not all mailboxes are created equal. Different spam filters mean vastly different inbox placement for the same email. With inbox placement testing it's easy to identify gaps in your sending across various mailbox providers.
Our seed lists are comprehensive, so you can trust that you’ll get a detailed look into email performance across a diverse list of global mailbox providers.


All-in-one email delivery
Unified platform – simplified experience
With other email service providers, you have to use their tool for sending and a third-party provider for seed testing. If you use Mailgun Send and Mailgun Optimize together, you have a one-stop-shop for your sending and your email deliverability tools like email address verifications, email previews, reputation monitoring and more.
Save time and money while simplifying and improving your email program with our comprehensive suite of sending and deliverability products.