Hi there,
Imail has a features that checks if the sender email address
exists.. That means they connect with SMTP to the MX for the domain, they
send the MAIL FROM, and they send the RCPT TO, and if the server complains,
then they assume it is because the email does not exist.
That sounded great from a start, but when I implemented it, I found
that the number of false positives was really high. I still did not figure
out why...
Another nice feature, and simpler in fact would be to "validate" the
sender server, so if the email is incoming (not from an authenticated local
user), imail would make a search for the DNS of the domain, and if the
server is in the list of MX, then fine, but if the server is not, then
TAG/BOUNCE/DEL/WHATEVER....
Of course this might raise trouble in those big domains where there
are hidden SMTPs or diverse gateway settings... but it would be a nice
aproach, or another option at least. In fact it would be a minor
modification of the current server check...
Any idea if this is done by other mail servers? Or how can this be
acomplished by IMAIL?
Also another thing, about delivery rules...
When a rule redirects the email to an email address instead of a
mailbox inside the original email address, there is no way to know what rule
redirected the email, or what was the mailbox that originally received the
email. Those are two different problems but related because if you setup an
antispam set of rules, with many rules, and you forward the emails to a
storage mailbox, then you don�t know important things like WHY was it
filtered, and to WHERE it was intended... and sometimes to figure out that
information can be extremely difficult. If the domain of the forward rule is
local, and the the "X-IMAIL-RULE" tag is enabled, then the tag should be
added to the header. (Currently this only happens if the rule redirects to a
mailbox instead of a full email address)
Any idea how to overcome these issues?
Thanks for listening.. err.. reading ;)
Alchaemist
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