Initial skills documentation — 25 categories, all SKILL.md + references + scripts

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+# Mail server discovery
+
+Not always on the same machine as the agent. Before assuming mail is local:
+
+## Step 1: Check DNS (MX record)
+
+```bash
+host -t MX <domain.com>
+host <mailhost.domain.com>
+```
+
+The MX record reveals the actual mail server host. The A/AAAA records show its IP. If the IP differs from the agent's host, mail is remote.
+
+## Step 2: Check local MTA/IMAP services
+
+```bash
+dpkg -l 2>/dev/null | grep -iE 'dovecot|postfix|exim|sendmail|courier'
+systemctl list-units --type=service --state=running | grep -iE 'mail|dovecot|postfix|exim'
+```
+
+If nothing is installed, mail is definitely remote.
+
+## Step 3: Check for Docker-based mail stacks
+
+```bash
+docker ps 2>/dev/null | grep -iE 'mail|dovecot|postfix'
+```
+
+## Step 4: Locate mail storage
+
+Common paths for local mail:
+- `/var/mail/` — traditional mbox spool
+- `/var/vmail/` — virtual maildir (Postfix/Dovecot)
+- `/home/vmail/` — alternate virtual maildir
+- `/srv/mail/` — manual setup
+- `/var/lib/dovecot/` — Dovecot index storage
+
+### When mail is remote
+
+The agent connects via IMAP/SMTP. Disk usage questions are moot — the user must check with their mail hosting provider. The agent can still:
+- Connect via IMAP to read/search/move messages
+- Send via SMTP
+- Check the user's mxrouting.net / mail provider control panel for storage quotas