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However in case of broken SMTP servers you should include as a last resort MX and IPv4 only entry in your MX lists. See [http://www.rfc.org/rfc3974.txt RFC 3974]. | However in case of broken SMTP servers you should include as a last resort MX and IPv4 only entry in your MX lists. See [http://tools.ietf.org/html/rfc3974 RFC 3974]. |
SMTP server guidelines
In general your MX records can point to servers with IPv6 address: SMTP will use IPv6.
However in case of broken SMTP servers you should include as a last resort MX and IPv4 only entry in your MX lists. See [http://tools.ietf.org/html/rfc3974 RFC 3974].