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[Discuss] vz outgoing mail

On 10/1/2014 11:02 PM, Matthew Gillen wrote:
> (putting the localhost in square brackets to avoid MX resolution was a
> neat bit of arcana)

It's even more neat than that. One of the purposes (maybe the original
purpose?) is to use IP addresses in SMTP fields:

  define(`SMART_HOST', `[]')dnl

It also works (should work, anyway) in mail address fields:

  To: discuss@[]

for example. That will almost certainly cause all sorts of problems
since you're not getting MX processing and any filtering based on domain
part will probably fail, but it is a syntactically valid mailbox per RFC

Rich P.

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