On Wednesday 21 January 2004 10:30 pm, wayne wrote:
I'm thinking that we should always check *both* the HELO and the MAIL
FROM:. An invalid HELO string causes the connection to be immediately
rejected.
Some MTA's do check that the HELO string is a FQDN and reject if not - my own
ISP did this for a while last year, during a bad virus 'storm'. (epidemic?)
Unfortunately I am not sure if their check (looking for a dot in the string)
was quite correct. After all 'museum' is a FQDN, isn't it?
And the spec says it does not need to resolve, so I guess anything goes
really...
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