diff --git a/infrastructure/production/host/stalwart/install.sh b/infrastructure/production/host/stalwart/install.sh
index 43ec8bc..e24ace8 100755
--- a/infrastructure/production/host/stalwart/install.sh
+++ b/infrastructure/production/host/stalwart/install.sh
@@ -155,7 +155,9 @@ warn "      3. remove the two STALWART_RECOVERY_* lines, restart again"
 warn "      4. white-label the groupware defaults via management JMAP:"
 warn "         x:Calendar/set + x:AddressBook/set update singleton"
 warn "         defaultDisplayName -> 'Calendar' / 'Contacts' (Stalwart ships"
-warn "         'Stalwart Calendar'/'Stalwart Address Book')"
+warn "         'Stalwart Calendar'/'Stalwart Address Book'); and the SMTP"
+warn "         banner: x:MtaStageConnect/set singleton smtpGreeting expression"
+warn "         system('hostname') + ' ESMTP'  (default says 'Stalwart')"
 warn "  • PTR/rDNS for the server IP MUST be 'mail.dezky.eu' (Hetzner Robot)."
 warn "  • Publish DNS at simply.com: MX → mail.dezky.eu, SPF, DMARC; per-domain"
 warn "    DKIM records come from Stalwart's dnsZoneFile via platform-api."