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Re: Underscores in host names
At 6:10 PM -0700 2005-05-18, william(at)elan.net wrote:
Check Guinea-Bissau for .gw. This has been a source of heartburn for many years. Any site that has a mail gateway system and uses unqualified hostnames is at risk, because mail to "fred@gw" could legitimately be interpreted two different ways, and mail could be mis-directed.The only reason it has not been discussed more actively is that no TLD operator has yet come forward and said that they are going to use TLD host for emails, but as soon as one does this would have to be accommodated and quickly (otherwise it will remain as an open issue for future update to SMTP - probably RFC4821 if this numbering continues :)
I did some consulting at a major wall street trading firm that had this problem, and the only reason we ever found out that something truly bizarre was going on was because we were getting back these bounces which we couldn't explain, because we knew for sure that the user portion was legitimate. Then we started looking closer at where the bounces were actually coming from.
Brad Knowles, <firstname.lastname@example.org>
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin (1706-1790), reply of the Pennsylvania
Assembly to the Governor, November 11, 1755
SAGE member since 1995. See <http://www.sage.org/> for more info.