There is no DHCP setting for NTP, true, but we got these endpoints (since 2.2.4):
/hub/advanced/scanForNtpServers - scans local network for NTP servers and shows the list.
/hub/advanced/ntpServer - shows current NTP server
/hub/advanced/ntpServer/<-value-> - sets NTP server
In my limited experience, emails sent using SMTP from a home IP address are most likely to get rejected outright by the ISPs, anyway. There are too many malware/spambot networks out there. Even with reputed providers, deliverability is hit and miss.
