Date: Fri, 27 Aug 2010 02:28:30 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Ronald Klop <ronald-freebsd8@klop.yi.org> Cc: freebsd-stable@freebsd.org, Andriy Gapon <avg@icyb.net.ua> Subject: Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop) Message-ID: <20100827092830.GA21076@icarus.home.lan> In-Reply-To: <op.vh3ay3dx8527sy@212-123-145-58.ip.telfort.nl> References: <4C74261A.4000401@icyb.net.ua> <op.vh27cqoy8527sy@212-123-145-58.ip.telfort.nl> <20100827082128.07538364425@drugs.dv.isc.org> <op.vh3ay3dx8527sy@212-123-145-58.ip.telfort.nl>
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On Fri, Aug 27, 2010 at 11:22:05AM +0200, Ronald Klop wrote: > Mandatory? I'm googling, but can't find a document that declares it > mandatory and only sendmail seems to do it. > I think it is lame to use DNS info to rewrite e-mail addresses, but > the person who made it 'mandatory' will have good reasons for it. > > Does somebody have a pointer to the specs about this? First hit on Google: http://www.ferris.com/2008/09/08/why-you-shouldnt-mix-cname-and-mx/ Bottom line: don't use CNAMEs, ever, unless you know ***exactly*** what you're doing. It's been like this for a very long time. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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