The older paid plans no longer offer the ability to add dedicated IPs to your account. If you require dedicated IPs please upgrade to one of our new plans from the Accounts/Billing page. Please note that new plans from 150K upwards include a dedicated IP, allowing you to add an IP Pool and new IP.…

When you switch to a new plan (either upgrade or downgrade), you won't be able to later switch back to an old plan that we no longer offer.

If you send mail through SMTP rather than REST, you may encounter some SMTP error messages. Here's what to do when you receive them.

If you're sending via SMTP you may wonder why configure DKIM? Learn why configuring DKIm is the best way to protect your sending reputation.

Our sink server allows you to perform sink test messages for integration testing without attempting delivery of email to actual addresses.

Understanding delays and bounces. If the final disposition for messages sent from SparkPost is delivered or bounced, what are delays? Learn more here.

Time series graphs on the summary page calculate most rate metrics against the number of targeted messages. Display the results for specific times and more.

It can take a minute for suppression events like spam complaints, unsubscribe requests, and hard bounces to be collected and processed. Learn more here.

SparkPost doesn't store images for you. If you are not using a front end application where you can store your images, here are some recommendations.