If you use Blackberry Internet Service and have seen delivery issues related to SPF records when using your own domain name or company domain name you should consider the following suggestions:
Firewall and connection requirements for the BlackBerry Internet Service
Corey Gilmore’s Blog
Easy SPF Wizard
Example:
$ host -t txt somedomainyouareusing.com
somedomainyouareusing.com text "v=spf1 a:smtp01.bis.na.blackberry.com a:smtp02.bis.na.blackberry.com a:smtp03.bis.na.blackberry.com a:smtp04.bis.na.blackberry.com a:smtp05.bis.na.blackberry.com ~all"
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Rob,
Nice catch!
$ host smtp01.bis.eu.blackberry.com
smtp01.bis.eu.blackberry.com has address 67.223.92.48
smtp01.bis.eu.blackberry.com has address 216.9.253.48
$ host 67.223.92.48
48.92.223.67.in-addr.arpa domain name pointer bda-67-223-92-48.bise.na.blackberry.com.
$ host 216.9.253.48
48.253.9.216.in-addr.arpa domain name pointer smtp01.bis.eu.blackberry.com.
These appear to be within 216.9.240.0/20 and 67.223.64.0/19 so if someone walked the cidr range a lot more would be known.
- spam
- offensive
- disagree
- off topic
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