i ran into this a week ago for a 1 off request from a customer who needed an "_" to use some 3rd party email service.
i just added it to the db.domain.name.include file be hand -- Open WebMail Project (http://openwebmail.org) ---------- Original Message ----------- From: Michael Stauber <mstau...@blueonyx.it> To: blueonyx@mail.blueonyx.it Sent: Mon, 13 Aug 2018 14:02:19 -0500 Subject: [BlueOnyx:22318] Re: DNS > Hi Colin, > > > I have been asked by a client to create a new CNAME record on the DNS > > for the following: > > > > NEW Record Type: CNAME > > > > Hostname: _69F8BF440B0DA58166380745E0EB4F5F.domain.co.uk > > > > Point to: > > 57BB458482A5AB33474E97891351014E.E610BBD363C7C2E032B35DDA755B2B52.55WcQD58 V50sJqcKeKP5.comodoca.com > > > > Bind says no! :-/ > > > > It won’t accept either of the host names using the GUI and adding it to > > the include file causes an error. > The regular expressions that the GUI uses to validate input type > "hostname" is like this: > > <typedef name="hostname" type="re" > > data="^(([a-z0-9]|[a-z0-9][a-z0-9\-]*[a-z0-9])\.)*([a-z0-9]|[a-z0- > 9][a-z0-9\-]*[a-z0-9])$" > > /> > > So ... no upper case characters and no leading "_". Granted, we're a > bit more strict there than RFC 952 and RFC 1123, which say that the > characters are case insensitive. Meaning: Put a big "A" there or a small > "a" and it doesn't matter. Both are treated as the same. > > Still: The fact remains that host- and domain names (according to > RFC) may not start with anything *but* a character or (as of RFC > 1123) a number. Hence: The underscore is a total no-no. > > Unless you're talking domain keys (which are deprecated anyway) or > SRV records. > > I guess what your client really wants is either a CAA-record or a > SRV-record and not a C-name? > > -- > With best regards > > Michael Stauber > _______________________________________________ > Blueonyx mailing list > Blueonyx@mail.blueonyx.it > http://mail.blueonyx.it/mailman/listinfo/blueonyx ------- End of Original Message ------- _______________________________________________ Blueonyx mailing list Blueonyx@mail.blueonyx.it http://mail.blueonyx.it/mailman/listinfo/blueonyx
