On Aug 24, 2008, at 1:45 AM, Darrell Burkey wrote:
I've had a client ask me how they can keep track of who unsubscribes
from their lists so that they don't accidentally resubscribe the
same address at some later point.
If they are properly confirming subscriptions, then there really
shouldn't be any "accidental" re-subscriptions. So this makes me
suspicious about what your clients are up to.
Unless anyone has any better advice I'm consider writinging a hack
to copy unsubscribe addresses to a file that can be checked before
subscribing someone.
When someone unsubscribes from a list, they may not want you to keep
their email address at all. I would recommend that you keep a hash of
each unsubscribed email address instead of the email address itself.
Of course that won't catch matches between, say,
[EMAIL PROTECTED]
and
[EMAIL PROTECTED]
Those may or may not be "the same address". You can safely lowercase
the domain part of the email address, but I'm not sure what to do when
creating the hash for addresses with uppercase in the local-part.
Cheers,
-j
--
Jeffrey Goldberg http://www.goldmark.org/jeff/
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