When your system sends email through an API, nobody is watching each message leave. The statistics are how you know it arrived. For an Australian online store, a missed shipping confirmation means a customer call; for a clinic, a missed booking reminder means a no-show. This page explains which API statistics to monitor and what to do when they change.
The core numbers
Accepted and delivered
“Accepted” means Mailpro received the request. “Delivered” means the recipient’s mail server accepted the message. A gap between the two points to problems at the receiving end, such as full mailboxes, blocks or invalid addresses.
Bounces
A hard bounce is permanent: the address does not exist. A soft bounce is temporary: a full mailbox or a server that is briefly unavailable. Stop sending to hard bounces straight away; persistent sending to invalid addresses harms your sender reputation.
Opens and clicks
For transactional email, opens tell you whether customers are reading receipts or confirmations. Clicks show whether they use the links, such as a tracking link or “manage booking”. Treat opens as a trend, since privacy features in some email apps can inflate them.
Complaints and unsubscribes
Transactional emails should rarely generate complaints. If they do, check whether a template has picked up marketing content. Under the Spam Act 2003, a message that promotes goods or your brand is commercial and must include an unsubscribe.
Getting the data
You can view statistics in the Mailpro dashboard or pull them into your own systems. Webhooks push events such as delivered, bounced, opened or clicked to a URL you choose, so your app can react in real time. See the FAQ on setting up a webhook.
Patterns to watch for in Australia
- Peak-period failures. Check delivery rates closely around EOFY, Click Frenzy, Black Friday and Christmas, when volume spikes and receiving servers apply stricter limits.
- Domain-specific issues. If bounces concentrate on one provider, such as a large Australian ISP’s mail service or a corporate domain, the problem is usually at their end or with your authentication. Check SPF, DKIM and DMARC.
- Legacy addresses. Old ISP email addresses from providers that have closed or changed their mail services can start hard-bouncing. Clean them from your database.
- Time-of-day effects. For non-urgent messages, compare engagement by state. A reminder sent at 6am AWST may be opened later than one sent at 9am.
Statistics and privacy
Delivery and engagement logs link email addresses to behaviour, which makes them personal information under the Privacy Act 1988 for covered businesses. Keep only what you need, restrict access, and know where it is stored. Mailpro keeps logs and statistics in Switzerland on private infrastructure, outside US jurisdiction, and never sells or rents data.
From numbers to action
- Delivery rate falls: check authentication and recent bounces.
- Hard bounces rise: validate addresses at sign-up, for example with double opt-in.
- Low clicks on key links: move them higher in the template.
- Complaints appear: remove promotional content or add proper consent and unsubscribe handling.
For the bigger picture, return to the email API overview or compare with SMTP statistics.