Micheal Espinola Jr wrote: > brougham Baker wrote: >> A quick thought here- RBL uses an A record type lookup- >> somewhere.nasty.com gives 127.0.0.2 (scumbag)- these are nice small >> (UDP) >> queries. Whereas SPF has to look up a TXT record to get the SPF string- >> could these be going over the UDP limit? Could TCP based DNS queries be >> blocked or just the TXT lookup? > > You and I are on the same wavelength. I put in a request to see if > they are. I know that certain types of DNS lookups (in Windows 2000+ > AD environments anyways) will use UDP instead of TCP. This very well > could be the issue. I haven't had a chance to research the > particulars myself, but it sure seems a likely candidate at this point. > > Actually, I said that bass-ackward. UDP is used by default, and TCP is used when the request is over 512 bytes.
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