spamdyke has no flaws, I thought everyone knew that. :) Perhaps I
should update the FAQ.
To answer your questions:
Once enabled, spamdyke's graylist filter will block anything that isn't
explicitly whitelisted, including newsletters, mailing lists, etc. Some
mailing lists (depending on the mailing list software) use "tagged
senders", which means that every message appears to come from a
different sender. This is done so that bounced messages can be more
easily matched with a specific mailing list and recipient. (Ezmlm and
Yahoo lists both use tagged senders. Mailman does not. I'm not sure
about Listserv and Majordomo.) For those kinds of lists, every message
is graylisted. This isn't really a problem however, as the remote
server will simply retry delivery and the message will be received. The
QMT list uses tagged senders and I receive its messages just fine. Some
users may complain about the (small) delay, however. I'll probably
incorporate some heuristics in a future version of spamdyke to allow
mailing lists with tagged senders to bypass graylisting (but it may be a
while before that's done).
Online ticket orders, receipts, password verifications and other
automated messages should pass the graylist filter as long as they are
being sent from a real mail server. In other words, as long as the
remote server attempts to redeliver the message, it will be received.
Graylisting works fine with all of the major email hosts and every mail
server I've ever encountered.
An SSL certificate is only needed for using TLS (an encryption protocol
that allows email to be sent securely). Only one certificate can be
installed on a server (one per domain is not possible) but you don't
have to pay for it -- a self-signed certificate works just fine.
The sender and recipient blacklists are just text files, so editing them
is very easy. The graylist system uses a directory structure that
contains files named after the senders and recipients. It's not as easy
to edit manually (nor is it difficult) but you shouldn't ever need to.
spamdyke has no mechanism for saving rejected messages. It works by
rejecting the message before the remote server even sends it, so
spamdyke never sees its content. For that reason, it is not possible to
recover rejected messages. However, spamdyke does log the sender and
recipient addresses for every message (accepted or rejected), along with
the reason the message was rejected. This does make it possible to
determine if a delivery was attempted and why it failed.
Obviously, I've been using spamdyke for years now with no problems.
spamdyke has an active mailing list (subscribe at www.spamdyke.org) with
many helpful and responsive people. You should probably pose these
questions there to see what they have to say.
-- Sam Clippinger
Kent Busbee wrote:
I've heard so many good things about spamdyke, I am wondering what flaws
it might have. From my understanding greylisting is the key to its
success.
-Will it block wanted newsletters, email lists, email subscriptions? Or
will it greylist the first attempt and then deliver the next a day, week,
or month later.
-Will it unintentionally prevent things like online tickets orders,
receipts from online orders, password verifications, etc.
-Does it work well with the major online email systems accepting emails
from gmail, yahoo, hotmail, etc.
-Do you need an Certificate SSL for your site? For each site hosted?
-Is it easy to tweek the lists? Move an address/domain from greylist to
whitelist or blacklist?
-If a message is lost/rejected/greylisted, is it possible to pull it back
and deliver it?
-What other problems/unexpected results did you get from installing?
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