On Fri, Apr 08, 2011 at 01:52:29PM +0200, Reindl Harald wrote: > > I don't think it's a good idea, it's part of the standard. We have smaller > > (legitime) mail servers receiving mails having only A record. Why would I > > need MX record, if A is ok for me? I only set up MX records when it's > > needed (the DNS name itself has an A record already but MTA receiving its > > mail is not at the same address as A record would tell), otherwise I leave > > it > > alone with the A record only. I think there is no problem with this > > practice. > > in fact you should not do this because it needs two dns-queries for > the sending server everytime and you set the MX only once
Yes that's true, however we have some customers with really low-traffic mail domains but they have totally messed up DNS setup sometimes (having IP address in MX record, CNAME/MX collusion etc - and we have no control over their zones) so only in this case it's a local policy here to suggest the simpliest dns setup, even if it needs an MX lookup first then for A. I would not do this with any other MTAs receiving more mails than only "some".
