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Saturday, January 25, 2003 |
Make sure you have DNS configured properlyI got bitten by this one a while ago, when an important client said they couldn't send us e-mail because their mail server was now doing reverse DNS lookups. A call to our ISP quickly resolved the matter (pun intended).
Reverse DNS lookups are not actually required in the RFCs for SMTP servers, but more and more people are using it. Unfortunately, as illustrated by AT&T's example, many domains are not set up to resolve reverse DNS lookups.
AT&T WorldNet has to defuse a risky spam-filtering technique introduced only a day ago after subscribers discover they are losing legitimate e-mail. [CNET News.com]
You can check your DNS settings at DNS Stuff.
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