We can’t guarantee any inbox delivery guarantee. Because even if our mailing servers are working in perfect condition with high reputed IP’s still inboxing depends on many other factors like
Bounce Rate
Spam Complaints
Sender Reputation
Email Size
Data Quality ( Double Optin, Non-Optin Data, Etc.)
All the mentioned things above are not in our control. So, it not just from us. No one can give in boxing guarantee until and unless it’s very recent double opt-in data. But we can guarantee maximum delivery rate if there your data is double opt-in, in that case, we can get maximum results for each of your email campaigns.