> For the complete documentation index, see [llms.txt](https://help.openletterconnect.com/olc-help-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.openletterconnect.com/olc-help-docs/getting-started/setting-up-your-account/address-strictness.md).

# Address Strictness

Open Letter Connect uses address validation to help prevent wasted postage. You can choose how strictly the system checks addresses before mailing.

#### Two Modes:

<figure><img src="/files/ixoJdHEw9PMeXNR9cAVw" alt=""><figcaption></figcaption></figure>

**Mode 1: Strict - Only allows mail to verified addresses.**

<sub>🟢 Good for legal notices, compliance-based mailings.</sub>

<sub>🚫 Records marked “corrected” or “failed” will be excluded.</sub>\
\
**Mode 2: Normal (default): Sends to verified and corrected addresses.**

<sub>🔄 “Corrected” means the address was adjusted automatically using USPS/NCOA.</sub><br>

**To update:**

1. Go to Settings › General.
2. Set Address Strictness to either Strict or Normal.
3. Click Save.\ <br>