Letter add-ons
Last updated
Was this helpful?
Last updated
Was this helpful?
Letter envelopes can be customized with branding, artwork, or messaging to communicate vital information to your recipients even before they open the envelope. Lob offers limited customization for some envelopes, including standard #10 outer envelopes (single-windowed) and #9 return envelopes (no window / single-windowed options).
For more details, see .
Paper cards can now be affixed to letters, providing a compelling method to direct customers to special promotions and drive engagement, both online and in-store. Having “faux” cards can serve as a tangible and memorable reminder for any upcoming marketing promotion.
To get started with letters with card affix, check out our or visit our for inspiration.
Cards must be created, ordered, and printed, and available in your inventory before they can be utilized.
Upload your front and back designs to create a new card, then order inventory for your card. Cards can be purchased as a one-off order or through auto-reordering.
Allow an estimated 20 business days for cards to be available for use in your Lob dashboard.
The minimum order quantity is 10,000 cards per artwork design submitted.
Spoilage is an industry norm that occurs during print set-up and processing. Based on the industry average, we recommend adding 2-3% to account for spoilage.
Timing and delivery is dependent on order size and complexity, and may be additionally delayed by forces outside of Lob's control (e.g. USPS delays, printer site shutdowns due to Covid, paper shortages, extreme weather events).
Once cards are ordered, they cannot be sent with letters until your Lob dashboard indicates they are fully stocked and available in your inventory. An email will notify you once your cards are in stock and are ready to be sent with letter campaigns.
The minimum send quantity is 5,000 cards per letter campaign. If a letter campaign is created with a specified card ID that is not in stock, the request will be rejected. Affixing charges will be billed with each Letter API call made, which is separate from the initial card order.
Special considerations when sending card-affixed letters:
Letters with card affix are limited to a single sheet at max (can be double-sided)
Cards can only be affixed horizontally to the top fold of a tri-folded letter, and to the face letter on the first page
Card-affixed letters will be sent in a standard #10 double-windowed envelope
Card-affixed letters cannot be sent with custom envelopes or buckslips at this time
Card-affixed letters cannot be used with Certified or Registered Mail at this time
When using the Letters API single endpoint (https://api.lob.com/v1/letters), cards must be sent in groups of at least 5,000 card-affix letter API requests during any 24-hour print-day period from 10AM PT to 10AM PT. If you do not, you may incur setup costs of $250/day on your monthly usage invoice. Reach out to your dedicated Customer Success Manager if you have questions.
Currently we do provide the following card affix offering:
Cards affixed to letters (one sheet total, front-side only)
Static, non-personalized artwork designs for paper cards
Horizontal card orientation in a single size
Cards affixed to the top fold of a trifold letter towards the right
Letters sent in standard #10 outer envelopes
We do not support the following offerings:
Cards affixed to any other mail format (e.g. self-mailers)
Cards affixed to letters that totals more than a single page, or on the back-side
Dynamic, personalized artwork designs that are unique to the recipient
Plastic cards (e.g. credit or loyalty cards)
Vertical card orientation or different card sizes
Cards affixed to any desired location on a letter
Letters sent in customized #10 outer envelopes
Card affix for Registered or Certified letters
Buckslips are small mail inserts that can be sent with letters to improve your ROI on marketing campaigns. These attention-grabbers can add pops of color in an otherwise plain-looking letter, and combined with compelling promotions, can be a very cost-effective solution to boost your response rates.
Anything sent with Buckslips will have a 4-day SLA.
Check out our:
Or watch a quick demo of ordering buckslips and sending them with letters via the dashboard
Buckslips must be created, ordered, and printed, and available in your inventory before they can be utilized.
Upload your front and back designs to create a new buckslip, then order your inventory. . Buckslips can be purchased as an one-off order or through auto-reordering.
The minimum order quantity is 10,000 buckslips per artwork design submitted
Allow an estimated 10 business days for buckslips to be available for use in your Lob dashboard.
Spoilage is an industry norm that occurs during print set-up and processing. Based on the industry average, we recommend adding 2-3% to account for spoilage.
Once buckslips are ordered, they cannot be sent with letters until your Lob dashboard reflects they are fully stocked and available in your inventory. An email will notify you once your buckslips are in stock and are ready to be sent with letter campaigns.
The minimum send quantity is 5,000 buckslips per letter campaign. If a letter campaign is created with a specified buckslip ID that is not in stock, the campaign request will fail.
Special considerations for sending letters with buckslips:
Only 1 buckslip max per letter request
Buckslips counts as one sheet in a letter
Any letter including a buckslip can have a maximum total of 6 sheets (5 letter sheets + 1 buckslip) to fit in a #10 standard envelope
Said another way, a buckslip cannot be inserted in letters over 6 sheets, as it cannot be inserted in a flat envelope at this time
Custom envelopes (outer & return envelopes) are supported for letters with buckslips
Buckslips cannot be sent with card-affixed letters at this time
Buckslips cannot be used with Certified or Registered Mail at this time
Buckslips cannot be sent using the single endpoint Letters API at this time
Depending on the custom mail type selected, you will see some of the following details of your ordered design:
Design
Size
Type
Finish
View the number of remaining custom items in your inventory and the number of orders that are still outstanding or fulfilled. Inventory statuses include:
Available: Inventory currently in stock and ready to use
Reserved: Inventory allocated for scheduled campaigns
Remaining: Inventory available, less reserved inventory
Inventory for custom items will decrement as you send letters with the add-on item of a specific design, and increment if you cancel a letter request. It may take a few minutes for the inventory quantity to update after any action.
Alternatively, use a GET call to the item endpoint to return a list of all items on your account, and any available and pending inventory.
Buckslips: https://api.lob.com/v1/buckslips
Cards: https://api.lob.com/v1/cards
Envelopes: https://api.lob.com/v1/envelopes
Accurate inventory management is essential for ensuring that we have the right products available to meet our customers' needs. Lob has automated tools and physical audits in place for regularly reconciling inventory, but we need to account for product spoilage.
We are focused on addressing routine product spoilage that occurs during print set-up and assembly: Mailpieces generated during setup and testing are discarded along with any misprints or damaged pieces. For items printed on demand, this is not an issue, but for orders using pre-printed custom inventory, this ultimately impacts the accuracy of Lob's reported inventory.
By addressing this issue and accounting for spoilage at the time of processing, we can improve the timeliness and accuracy of our inventory, to the benefit of your mail campaigns.
An auto-triggered overnight job will calculate spoilage from the previous production day and Lob will decrement it from your inventory accordingly.
As a proactive measure, based on the industry average, we recommend adding 2-3% to account for spoilage when ordering custom inventory (custom envelopes, cards, buckslips).
By addressing this issue and accounting for spoilage, we can improve the timeliness and accuracy of our inventory, to the benefit of your mail campaigns.
Given add-on items require additional lead times for printing and stocking in inventory, we recommend enabling auto-reordering for any items that will be continuously utilized to ensure there will be no risk of running out. When reordering is turned on, a new order will be submitted whenever the remaining inventory quantity falls below 20%. A confirmation will show the reorder quantity and price that will be charged.
To turn on auto-reordering:
Select the design you would like to auto-reorder
Go to the Auto-Reorder Settings section, click Set Up, set auto-reorder to on, and hit Save
Add a reorder quantity, the number of items to be ordered when your most recent order falls below 20% of the original order quantity, and hit Save
To turn off auto-reordering:
Go into the same Auto-Reorder Settings
Set the auto-reorder button to off, and hit Save
Order details for any particular item design will be populated in the order history window once submitted, including order date, item ID, order quantity, inventory status, and expected availability date.
Order status: Provides current item status
Pending: Lob is reviewing the order submission
In Production: The order is being fulfilled
Available: Item is available in inventory and ready for use
Expired: For envelopes only; indicates if envelopes expired (after 6mo)
Canceled: Customer canceled order while status was pending
Estimated date: Lob’s rough estimation of when items may be available in your inventory. However, an email confirmation will be sent when they are actually ready for use.
Expand details: Each order under a specific design can be expanded by clicking on the ‘+’ sign to the right in each row, where the expiration date (envelopes only), unit price, and total order cost will become visible
Refer to our for more details on image prepping.
Go to the in the Lob dashboard and hit the Create button
Send a request to the /v1/cards with the following fields:
Send a request to the /v1/cards/{id}/orders with the following field:
See for letter add-ons
In “Configure Settings” Step 1 of the Letter creation flow, choose “Card” as your add-on
Adding cards to letters can be done via the :
Affixing cards to letters can be done via the , similar to Custom Envelopes
Buckslips can be sent through or the , but NOT through the single-endpoint Letter API.
Lob Dashboard: buckslips, or send with a
API documentation for , buckslips, or with buckslips
for design inspiration
Refer to our for more details on image prepping.
Go to the section in the Lob dashboard, and hit the Create button
Send a request to the /v1/buckslips with the following fields:
Send a request to the /v1/buckslips/{buckslip_id}/orders with the following field:
See for letter add-ons
In “Configure Settings” Step 1 of the Letter creation flow, choose “Buckslip” as your add-on
Adding buckslips to letters can be done via the :
For any letter add-on items (including buckslips, cards, or envelopes), you will have the ability to view existing orders and manage your own inventory for any designs that have been submitted. Go to your Lob dashboard and go to the section for , , or .
