Shared Rules between email accounts
I have an old email address which only has a few defined legitimate senders, so it works quite well as a honeypot account, because anything that is sent there from another sender is always spam, and I often see the same spam messages hitting my other accounts.
Is there a way that I can use the messages identified as spam on this account to generate spam filtering rules on my other accounts? It needs something like a set of rules on the master account for the domain which does some high level filtering before the mail hits the rule sets on the individual email accounts. |
I'm using a legacy account. Do the current plans still support individually trainable bayes databases for each user? If so you could move spam messages from the honeypot to the designated folder in the master account, so that it learns to recognize similar messages as spam. That would be easier and more robust than modifying rules sets in multiple accounts. That folder can be the same folder as your normal spam folder though you might prefer to use a different folder to make it easier to review your normal spam folder for errors that the global spam filtering made.
https://fastmail.blog/2007/08/31/imp...yes-databases/ I use a email client rather than webmail with fastmail and don't have shared accounts so I'm not sure how to automate that. If the new rules system doesn't let you move a message to another accounts mailbox perhaps a Sieve script does. |
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Sieve scripts might let you do what you want. It will run automatically upon the server receiving the new message. Think of it as server side message filtering.
You might be able to use a redirect command in a Sieve script to copy a spam message from the honeypot to a spam folder in another account if you use plus addressing to specify the destination folder as part of the other accounts email address. I had hoped you might be able to use the fileinto command instead but that doesn't seem to support any way to specify a folder in another account. See https://www.fastmail.com/help/technical/sieve.html and forwarding messages in https://support.tigertech.net/sieve See the writeup on plus addressing in https://www.fastmail.com/help/receive/addressing.html |
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Or autoforward from that account to your normal inbox but have a rule that anything forwarded from that account is marked as read and put into the spam folder? |
Are these different accounts completely separate Fastmail accounts where the spam is send directly to the main address or an alias at that account? Or are you discussing several aliases at one account, or an account at a non-Fastmail provider, or emails forwarded (or fetched) from a non-Fastmail account?
Have you gone to the trouble of examining the sending IP address and other details on the similar spam received at the two accounts? Spammers often switch the sending systems to get around spam filtering, and it's quite possible that the spam messages you receive which superficially appear to be similar were sent from different servers and have quite different spam signatures. Spam is quite varied, and unless you are getting slammed with many messages each day which are very similar, it's just not a good use of your time to mess around with custom filtering. I think that only reasonable solutions are:
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With respect to the actual Spam folder, I agree you should never set that folder's Spam learning to spam since that may falsely mark a message as spam if you don't intercept it before Spam learning's daily check. Not setting Spam learning (as recommended) gives you the opportunity to mark messages as not spam since stuff is learned as spam in the Spam folder only when you explicitly delete those items from the Spam folder. I believe this is why it's done that way. I guess this reasoning could be applied to other folders too (e.g., that "SpamReporting" folder) but I assumed you only put stuff in there that you knew was actually known to be spam. |
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Heh! I wonder what would happen if you did set the Spam folder to auto-purge but as "not spam"! I would assume no one would actually do that but the UI apparently doesn't stop you from doing it.:) Update: I think a more generalized way to describe what's going on would be to say deleting or moving stuff into or out of the Spam folder updates spam/non-spam learning at the time of the delete or move. |
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