A
Address Validation
Service that verifies postal addresses are valid and deliverable before sending mail. Helps reduce returned mail and delivery failures. Learn more about address validation →API Key
Secret credential used to authenticate API requests. Generate keys in your dashboard.B
Background
A reusable letterhead or design template that can be applied to multiple print jobs. Useful for company branding, logos, and headers/footers. Learn more about backgrounds →Base64
Encoding scheme for representing binary data (like PDFs or images) as text. Used when uploading files inline in JSON requests.C
Confirmed Print Job
A print job withconfirmed: true that has been submitted for printing. Confirmed jobs cannot be edited or cancelled once in production.
Coversheet
A separate page with the recipient’s address, automatically added to PDFs that don’t have addresses embedded. Also called an “address sheet”. Learn more about coversheets →D
Double-Sided Printing
Printing on both sides of paper to reduce the number of sheets used, saving costs. Also known as “duplex printing”.Draft Print Job
A print job withconfirmed: false that can still be edited, previewed, or cancelled. Drafts are not printed until confirmed.
E
Envelope
The physical envelope used to send letters. Intelliprint offers multiple sizes (C5, C4, C4+, A4 Box) depending on document thickness. Learn more about envelopes →Extra Documents
Additional PDFs included with a letter, such as brochures, T&Cs, or forms. Intelliprint prints these for you. Learn more about extra documents →F
First Class
Royal Mail service with 1-2 business day delivery. Costs more than Second Class but delivers faster.I
Idempotency
Mechanism to safely retry API requests without creating duplicate resources. Use idempotency keys to ensure a request is only processed once, even if sent multiple times.Insert
Pre-printed material (like business cards, vouchers, or samples) that Intelliprint stores and automatically includes in your mailings. Contact support to enable. Learn more about inserts →L
Letter
Standard mail item sent in an envelope. Can contain multiple pages, backgrounds, and extra documents.Live Mode
Production mode where print jobs are charged to your account and physically sent. Opposite of test mode.M
Mailing List
A stored collection of recipients with addresses and custom variables. Reusable for multiple campaigns. Learn more about mailing lists →Mailing List Recipient
An individual contact within a mailing list, containing an address and optional variables for personalisation.Metadata
Arbitrary key-value data you can attach to print jobs for your own tracking and organisation. Not visible to recipients.P
Postcard
Mail format without an envelope. Available in A5 and A6 sizes. Always in colour. Learn more about postcards →Postage Service
Royal Mail delivery service used for your mailings, such asuk_second_class, uk_first_class, uk_second_class_signed_for, uk_first_class_signed_for, uk_special_delivery, tracked_24, tracked_48, and international.
Learn more about postage →
Print Job
The core API object representing one or more letters or postcards to be sent. Each print job has a unique ID (e.g.,print_abc123).
R
Rate Limit
Maximum number of API requests allowed per second. Helps ensure reliable service for all customers. Learn more about rate limits →Recipient
A person or business who will receive mail. Contains an address and optional variables.Royal Mail
The UK postal service that delivers all Intelliprint mail items.S
Scheduling
Setting a future date for mail to be sent. Useful for timed campaigns or reminders.Second Class
Royal Mail service with 2-3 business day delivery. More economical than First Class.Sheet
One physical piece of paper. A letter with 4 pages printed double-sided uses 2 sheets. Pricing is based on sheets, not pages.Signed For
Royal Mail service requiring a signature on delivery. Provides proof of delivery via a delivery scan and signature but does not include full end-to-end tracking updates. Common API values:Splitting
Dividing a single PDF into multiple letters. Methods includesplit_on_phrase, split_on_pages, mailing_list, or none.
Learn more about splitting →
T
Template
HTML or PDF design created in the dashboard with variable placeholders like{first_name}. Variables are automatically replaced for each recipient.
Test Mode
Development mode where requests don’t charge your account and mail is not physically sent. PDFs are still generated for preview.Always test first! Use test mode to preview and verify your mail before sending it live.
Tracked
Generic term for postage services that provide tracking updates during a mail item’s journey, such asuk_special_delivery, uk_special_delivery_9am, tracked_24, and tracked_48.Signed For services provide a delivery scan and signature only (proof of delivery), not full in-transit tracking.

