You can use DNS NOTIFY rather than sending an email. When the primary is updated, DNS NOTIFY will tell each secondary about the change. DNS NOTIFY is standardi

You can use DNS NOTIFY rather than sending an email. When the primary is updated, DNS NOTIFY will tell each secondary about the change. DNS NOTIFY is standardised in: https://tools.ietf.org/rfc/rfc1996.txt https://tools.ietf.org/rfc/rfc1996.txt BIND 8+ supports it by default, according to http://docstore.mik.ua/orelly/networking_2ndEd/dns/ch10_03.htm http://docstore.mik.ua/orelly/networking_2ndEd/dns/ch10_03.h... There is a perl script to achieve the same thing in djbdns, according to http://www.fefe.de/djbdns/#notify http://www.fefe.de/djbdns/#notify (which joe_bleau alluded to).