Document credential separation: Nextcloud Mail uses different IMAP/SMTP credentials

skills/nextcloud-mail/SKILL.md

@@ -6,6 +6,22 @@
 
 **Server:** https://teamworkapps.com (Nextcloud 25.0.13)
 
+## Important: Separate Credentials
+
+**⚠️ NOTE:** The Nextcloud Mail integration uses **different credentials** from other Nextcloud tools (Files, Contacts, Calendar, etc.).
+
+**Other Nextcloud tools** use:
+- Nextcloud REST API / WebDAV / CalDAV / CardDAV
+- Server: `https://teamworkapps.com`
+- Username: `wltbagent@shortcutsolutions.net`
+- API Key: App token for API access
+
+**Nextcloud Mail** uses:
+- Standard IMAP and SMTP protocols
+- Different hostnames for IMAP/SMTP servers
+- Different username and password
+- These are email credentials, NOT Nextcloud API credentials
+
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 ## Bootstrap Process (Automatic)