Domain of sender address ... does not exist

[John Aldrich]

On Wednesday 16 December 2009, Philip A. Prindeville wrote:
> > Even if there's no website, there needs to be an "A" record. Since
> > it's a valid domain. I would guess they're trying to set up an
> > email-only domain and some mail servers don't like that. Just leave
> > the "parked" website up and running at your registrar and that might
> > work. OTOH, you might still need to put up a generic "under
> > construction" website to fool the spam- checkers so that the A record
> > and the MX record match.
> 
> Why would I need an A record?  All mailers should support MXing, right?
> 
> As long as my MX points to a name that has a valid A record, I should be
>  golden.
> 
In theory, you don't need an A record. However, some mail servers won't 
accept email from a domain that doesn't have an A record as an anti-spam 
measure. Even if the mail server has an A record, it may not be enough.