On Friday 20 March 2009 10:02:56 Matus UHLAR - fantomas wrote: >> Quoth Bob Cox at 2009-03-18 18:39... >> ... >> >> >The question is whether you should be rejecting email from any user >> >@act.gov.au just because act.gov.au does not resolve. > >On 18.03.09 19:31, Matthew Smith wrote: >> we need to >> be tolerant of such things as MX records not having corresponding A >> records - even though it makes our spam-filtering configuration that >> much harder. > >If a domain doesn't resolve, it's not available for e-mailing, thus it >should not be used in mail addresses (you can't mail there, you can't bounce >there...).
If it has an MX record, it is available for mailing. The A record is an old fall-back that is not required for proper mail delivery. The name contained in the MX record must (since an address is required to establish the SMTP connect) have an A or AAAA record, but the right-hand side of the email does not *have* to. -- Boyd Stephen Smith Jr. ,= ,-_-. =. b...@iguanasuicide.net ((_/)o o(\_)) ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-' http://iguanasuicide.net/ \_/
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