## Knowledge base

### [Direct Mail Basics with optilyz](https://help.optilyz.com/en/support/solutions/43000360914)

- [⏯ Welcome to optilyz](https://help.optilyz.com/en/support/solutions/articles/43000494334-%E2%8F%AF-welcome-to-optilyz)
- [Use cases and case studies](https://help.optilyz.com/en/support/solutions/articles/43000496579-use-cases-and-case-studies)
- [Who uses optilyz?](https://help.optilyz.com/en/support/solutions/articles/43000494266-who-uses-optilyz-)
- [optilyz plans](https://help.optilyz.com/en/support/solutions/articles/43000494337-optilyz-plans)
- [Benefits of direct mail automation](https://help.optilyz.com/en/support/solutions/articles/43000623945-benefits-of-direct-mail-automation)

### [Marketing Cloud Integrations](https://help.optilyz.com/en/support/solutions/43000373233)

- [Getting Started](https://help.optilyz.com/en/support/solutions/articles/43000050308-getting-started)
- [Finding your API key](https://help.optilyz.com/en/support/solutions/articles/43000720785-finding-your-api-key)
- [API Documentation](https://help.optilyz.com/en/support/solutions/articles/43000016594-api-documentation)
- [ActiveCampaign](https://help.optilyz.com/en/support/solutions/articles/43000635424-activecampaign)
- [Apteco](https://help.optilyz.com/en/support/solutions/articles/43000620942-apteco)

### [Manual Mailings (CSV Upload)](https://help.optilyz.com/en/support/solutions/43000373235)

- [Step-by-step guide](https://help.optilyz.com/en/support/solutions/articles/43000490935-step-by-step-guide)
- [Segmentation Mailing - Personalization made easy](https://help.optilyz.com/en/support/solutions/articles/43000530213-segmentation-mailing-personalization-made-easy)
- [How do I upload data for a single campaign?](https://help.optilyz.com/en/support/solutions/articles/43000494014-how-do-i-upload-data-for-a-single-campaign-)
- [How do I create a CSV file?](https://help.optilyz.com/en/support/solutions/articles/43000493964-how-do-i-create-a-csv-file-)
- [How do I open a CSV file (Windows)?](https://help.optilyz.com/en/support/solutions/articles/43000493976-how-do-i-open-a-csv-file-windows-)

### [Automations](https://help.optilyz.com/en/support/solutions/43000373236)

- [Introduction - what to consider](https://help.optilyz.com/en/support/solutions/articles/43000490986-introduction-what-to-consider)
- [Step-by-step guide](https://help.optilyz.com/en/support/solutions/articles/43000490999-step-by-step-guide)
- [Bundling of Use Cases](https://help.optilyz.com/en/support/solutions/articles/43000708423-bundling-of-use-cases)
- [optilyz Validation Report (Automations) - Quality check](https://help.optilyz.com/en/support/solutions/articles/43000681266-optilyz-validation-report-automations-quality-check)
- [Add Names To Variations](https://help.optilyz.com/en/support/solutions/articles/43000709315-add-names-to-variations)

### [Design](https://help.optilyz.com/en/support/solutions/43000373237)

- [What do I need to consider when preparing my design?](https://help.optilyz.com/en/support/solutions/articles/43000493951-what-do-i-need-to-consider-when-preparing-my-design-)
- [Design Templates (Germany) - Direct Download](https://help.optilyz.com/en/support/solutions/articles/43000716482-design-templates-germany-direct-download)
- [Design Templates (International)](https://help.optilyz.com/en/support/solutions/articles/43000016234-design-templates-international-)
- [Fonts - what to know and what to consider](https://help.optilyz.com/en/support/solutions/articles/43000658649-fonts-what-to-know-and-what-to-consider)
- [Can I also send printed envelopes with optilyz?](https://help.optilyz.com/en/support/solutions/articles/43000635408-can-i-also-send-printed-envelopes-with-optilyz-)

### [Personalisation](https://help.optilyz.com/en/support/solutions/43000373238)

- [Step-by-step: campaign automation including image personalization in digital printing](https://help.optilyz.com/en/support/solutions/articles/43000609139-step-by-step-campaign-automation-including-image-personalization-in-digital-printing)
- [Introduction: Why (Hyper)personalization is worth it](https://help.optilyz.com/en/support/solutions/articles/43000492881-introduction-why-hyper-personalization-is-worth-it)
- [Basics: Simple Personalisation](https://help.optilyz.com/en/support/solutions/articles/43000493959-basics-simple-personalisation)
- [Advanced: Image Personalization](https://help.optilyz.com/en/support/solutions/articles/43000682714-advanced-image-personalization)
- [Advanced: Text personalization](https://help.optilyz.com/en/support/solutions/articles/43000682725-advanced-text-personalization)

### [Data Transfer and Validation](https://help.optilyz.com/en/support/solutions/43000373239)

- [Introduction](https://help.optilyz.com/en/support/solutions/articles/43000491110-introduction)
- [Checking the quality of the data set - Using the optilyz Mailing List](https://help.optilyz.com/en/support/solutions/articles/43000658119-checking-the-quality-of-the-data-set-using-the-optilyz-mailing-list)
- [Transferring files via SFTP](https://help.optilyz.com/en/support/solutions/articles/43000491501-transferring-files-via-sftp)
- [S3 - Getting connected](https://help.optilyz.com/en/support/solutions/articles/43000492847-s3-getting-connected)
- [Data cleaning](https://help.optilyz.com/en/support/solutions/articles/43000492877-data-cleaning)

### [Vouchers](https://help.optilyz.com/en/support/solutions/43000373240)

- [How can I assign voucher codes?](https://help.optilyz.com/en/support/solutions/articles/43000494023-how-can-i-assign-voucher-codes-)
- [Salesforce // Multiple vouchers and vouchers per variation](https://help.optilyz.com/en/support/solutions/articles/43000563070-salesforce-multiple-vouchers-and-vouchers-per-variation)
- [How to connect a different voucher pool to each variation](https://help.optilyz.com/en/support/solutions/articles/43000698693-how-to-connect-a-different-voucher-pool-to-each-variation)
- [How to use multiple voucher pools on the same mailing?](https://help.optilyz.com/en/support/solutions/articles/43000698696-how-to-use-multiple-voucher-pools-on-the-same-mailing-)

### [Print and Postage](https://help.optilyz.com/en/support/solutions/43000373241)

- [How do I prepare my design for print?](https://help.optilyz.com/en/support/solutions/articles/43000492918-how-do-i-prepare-my-design-for-print-)
- [Triggering automated mailings on specific days](https://help.optilyz.com/en/support/solutions/articles/43000557479-triggering-automated-mailings-on-specific-days)
- [In which processing step is my mailing currently?](https://help.optilyz.com/en/support/solutions/articles/43000722105-in-which-processing-step-is-my-mailing-currently-)
- [Sustainability: Can I use FSC paper with optilyz?](https://help.optilyz.com/en/support/solutions/articles/43000608456-sustainability-can-i-use-fsc-paper-with-optilyz-)
- [Price Calculator](https://help.optilyz.com/en/support/solutions/articles/43000016236-price-calculator)

### [Delivery and Tracking](https://help.optilyz.com/en/support/solutions/43000373242)

- [How quickly will my mailing be delivered?](https://help.optilyz.com/en/support/solutions/articles/43000494070-how-quickly-will-my-mailing-be-delivered-)
- [Postal tracking for mailings with optilyz](https://help.optilyz.com/en/support/solutions/articles/43000659665-postal-tracking-for-mailings-with-optilyz)
- [Returns & Senders - What are the different specifications?](https://help.optilyz.com/en/support/solutions/articles/43000689095-returns-senders-what-are-the-different-specifications-)
- [Multi-country mailings: Is it possible to send to several countries within one mailing?](https://help.optilyz.com/en/support/solutions/articles/43000672554-multi-country-mailings-is-it-possible-to-send-to-several-countries-within-one-mailing-)

### [Proofing and Control](https://help.optilyz.com/en/support/solutions/43000373243)

- [Do you check my designs before they go into print?](https://help.optilyz.com/en/support/solutions/articles/43000493960-do-you-check-my-designs-before-they-go-into-print-)
- [Add control addresses to your direct mailing](https://help.optilyz.com/en/support/solutions/articles/43000559567-add-control-addresses-to-your-direct-mailing)
- [Will I get proofs?](https://help.optilyz.com/en/support/solutions/articles/43000493743-will-i-get-proofs-)
- [Is it possible to get a Proof PDF for my mailing?](https://help.optilyz.com/en/support/solutions/articles/43000624762-is-it-possible-to-get-a-proof-pdf-for-my-mailing-)
- [Print Proof Download Guide](https://help.optilyz.com/en/support/solutions/articles/43000775013-print-proof-download-guide)

### [Troubleshooting](https://help.optilyz.com/en/support/solutions/43000373244)

- [What do the strange symbols on my mailing mean?](https://help.optilyz.com/en/support/solutions/articles/43000668324-what-do-the-strange-symbols-on-my-mailing-mean-)
- [Why are there stains on my postcard?](https://help.optilyz.com/en/support/solutions/articles/43000706576-why-are-there-stains-on-my-postcard-)
- [Loading issues on the optilyz platform](https://help.optilyz.com/en/support/solutions/articles/43000608466-loading-issues-on-the-optilyz-platform)
- [Why is the final price of my mailing different from the costs in the price calculator?](https://help.optilyz.com/en/support/solutions/articles/43000713168-why-is-the-final-price-of-my-mailing-different-from-the-costs-in-the-price-calculator-)
- [How is optilyz affected by the xz backdoor?](https://help.optilyz.com/en/support/solutions/articles/43000725833-how-is-optilyz-affected-by-the-xz-backdoor-)

### [Terms and Conditions](https://help.optilyz.com/en/support/solutions/43000373245)

- [optilyz Partners](https://help.optilyz.com/en/support/solutions/articles/43000479932-optilyz-partners)
- [Data Protection Information](https://help.optilyz.com/en/support/solutions/articles/43000479934-data-protection-information)
- [Download the ClimatePartner seal to include in your mailings](https://help.optilyz.com/en/support/solutions/articles/43000719618-download-the-climatepartner-seal-to-include-in-your-mailings)
- [I require a certificate of optilyz’s compliance with the ISO 27001 Standard](https://help.optilyz.com/en/support/solutions/articles/43000711686-i-require-a-certificate-of-optilyz-s-compliance-with-the-iso-27001-standard)
- [Additional Service Fees](https://help.optilyz.com/en/support/solutions/articles/43000669296-additional-service-fees)

### [Platform](https://help.optilyz.com/en/support/solutions/43000375576)

- [Setting up Enterprise SSO & Automated User Provisioning (SCIM)](https://help.optilyz.com/en/support/solutions/articles/43000781279-setting-up-enterprise-sso-automated-user-provisioning-scim-)