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This tab provides statistics obtained from the Postmark email server. The details provided are...

Property	Meaning
Sent	The total number of email sent in the current period.
Opens	The total number of times email has been opened by the recipients. If a recipient opens the same email three times then this value is increased by 3.
Unique Opens	The total number of times email has been uniquely opened by recipients. If a recipient opens the same email three times then this value is increased by 1.
Spam Complaints	The number of spam complaints received.
Spam Complaint Rate	Total spam complaints as a percent of total email sent.
Bounced	The number of bounced emails sent
Bounced Rate	Total bounced email as a percent of total email sent.

The Bounce cell values are buttons that when clicked will provide further detail on the emails bounced in a secondary grid. This grid, in turn contains a Bounce Type cell which when clicked will provide full detail of the bounce including the recipient's details if available.

Engagement

Total Sent compared with Unique Opens can be used as a measure of engagement. The closer these figures equal each other, the more engaged your audience is. Opens compared with Unique Opens can however be a two-edged sword. More Opens than Unique Opens may indicate an interested and engaged audience or, it may indicate a complex email that may have to be read a number of times for readers to comprehend its content.

Bounces & Spam Complaints

There are many reasons why an email will bounce. Most will be either a Soft bounce meaning the issue is temporary and will probably resolve itself, or a Hard Bounce meaning Postmark will block further email to that address.

A notable exception to this rule is the Relay Access Denied error. This is most often caused when the domain part of a recipient's email address is incorrect. Postmark will report this as a Soft rather than a Hard bounce. To maintain good reputation this error must be acted on immediately.

Of all bounce notices spam complaints are the most problematic. Postmark's tolerance for spam complaints is 0.1% of email sent. You can expect Postmark to permanently deactivate email addresses reporting complaint if this tolerance level is exceeded. Multiple transgressions will result in email flow being paused until the situation is resolved.

A full list of bounce type provided by Postmark is provided below.

Name & Description
Soft bounce/Undeliverable — Unable to temporarily deliver message (i.e. mailbox full, account disabled, exceeds quota, out of disk space).
Hard bounce — The server was unable to deliver your message (ex: unknown user, mailbox not found).
Message delayed/Undeliverable — The server could not temporarily deliver your message (ex: Message is delayed due to network troubles).
Unsubscribe request — Unsubscribe or Remove request.
Subscribe request — Subscribe request from someone wanting to get added to the mailing list.
Auto responder — "Autoresponder" is an automatic email responder including nondescript NDRs and some "out of office" replies.
Address change — The recipient has requested an address change.
DNS error — A temporary DNS error.
Spam notification — The message was delivered, but was either blocked by the user, or classified as spam, bulk mail, or had rejected content.
Open relay test — The NDR is actually a test email message to see if the mail server is an open relay.
Unknown — Unable to classify the NDR.
Virus notification — The bounce is actually a virus notification warning about a virus/code infected message.
Spam challenge verification — The bounce is a challenge asking for verification you actually sent the email. Typcial challenges are made by Spam Arrest, or MailFrontier Matador.
Invalid email address — The address is not a valid email address.
Spam complaint — The subscriber explicitly marked this message as spam.
Manually deactivated — The email was manually deactivated.
Registration not confirmed — The subscriber has not clicked on the confirmation link upon registration or import.
ISP block — Blocked from this ISP due to content or blacklisting.
SMTP API error — An error occurred while accepting an email through the SMTP API.
Processing failed — Unable to deliver inbound message to destination inbound hook.
DMARC Policy — Email rejected due DMARC Policy.
Template rendering failed — An error occurred while attempting to render your template.

Statistics/Bounces

Statistics/Bounces