Why MailPace
Transactional emails need to arrive in the inbox now. They are often used for activities that require an immediate response (e.g. account verification) and slow transactional emails are not an option. In many cases users expect transactional emails to land in their inbox almost instantly, and it can be real detraction to customer confidence when they don't. If you've ever had to wait a few hours for a receipt for an online purchase, you will know exactly why.
At MailPace.com we measure, track and optimize for time to inbox. We publish live results for all to see to hold ourselves accountable to our fast transactional email delivery times.
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The figures above are calculated by sending an email to each of those providers, waiting for it to land in the inbox, retrieving the email and measuring how long the entire process took from start to finish. Each figure is updated every ten minutes, and the average covers the last twenty-four hours.