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Old 12 Jan 2021, 03:38 AM   #7
n5bb
Intergalactic Postmaster
 
Join Date: May 2004
Location: Irving, Texas
Posts: 8,929
Quote:
Originally Posted by barmadrid View Post
l...Is there any privacy/security advantage of using subdomians for email sign-ups compared to just company1@mydomain.com?...
I don't think there are any significant privacy or security issues related to using an alias as opposed to a subdomain at an alias.

If you are using the address for a service which you might want to block in the future or which you think might sell your address to spammers, there is an advantage to using a specific alias at your domain. This is because you can easily disable that alias at the Fastmail alias screen. If you experience a lot of spam to random aliases at your domain, you might want to not use the wildcard * alias (which allows delivery of any alias to your account, even if it's not enabled with a specific alias).

But for general use with businesses and web services, I think it's much easier to use subdomain aliases at one or more aliases at the domain. You can add them easily on the fly without needing to add the alias at the Fastmail setup screen. If you start to get spam at that subdomain address and want to disable it, you can always use a rule.

The Fastmail spam filter is pretty good. Read about Your personal spam database at:
https://www.fastmail.com/help/receiv....html#settings
This is a Bayes filter which you can train. It only starts acting on new messages after you have reported at least 200 messages as spam and 200 as non-spam. You can set up folders (or labels) which automatically mark messages as non-spam to make this easier. You can also block specific sender addresses or domains in the Settings>Filters & Rules screen at the top.

Bill
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