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Old 15 May 2019, 10:33 AM   #16
n5bb
Intergalactic Postmaster
 
Join Date: May 2004
Location: Irving, Texas
Posts: 8,499
Use subdomain if you get random alias spam

Quote:
Originally Posted by BritTim View Post
Deleted aliases in your own domain are much less of a problem than when they are in one of FastMail's domains. You can avoid lost email just by having a catch all alias (albeit at a cost of receiving some spam sometimes).
I don’t notice very many random alias spam messages to my personal domain these days, probably because Fastmail is blocking more messages at the SMTP acceptance stage. So a few months ago I re-enabled my own domain wildcard alias, and very rarely see any dictionary spam to my domain. Since I allow messages sent to any alias at my domain, a true dictionary spammer trying random or commonly used aliases would be obvious, and they might not be caught at the SMTP stage since they aren’t sending to non-existing addresses in an obvious manner.

If you want to disable the wildcard alias so that dictionary random attacks fail, here is what you can do:
  • Create an alias which is unusual so won’t be found by a random attack.
  • Choose to allow subdomain messages near the bottom of the Domains page. I use the first choice, which delivers messages sent to a subdomain to that alias. So messages sent to [email protected] are by default delivered to [email protected]
  • You then have an additional choice on the Aliases page of the delivery target for the [email protected] alias.
    • If the delivery target of the alias corresponding to the subdomain (“sub” in my example) is directly to your Fastmail account ([email protected]), the subdomain name is ignored and the final delivery to a folder (shown by the X-Resolved-To header) will be to [email protected], which attempts to deliver the message to your “test” folder.
    • If the delivery target for the alias corresponding to the subdomain (“sub” in my example) includes +* (plus asterisk), the subdomain name is used for the top-level folder target and the final delivery to a folder (shown by the X-Resolved-To header) will be to [email protected], which attempts to deliver the message to the “test” subfolder of your “sub” folder. I find this very useful, since all of the messages sent to that subdomain end up in the folder corresponding to that subdomain name (or a subfolder),
Bill
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