Quote:
Originally Posted by horatio8
Here's a quote from Bill from 2014:
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Is this still the preferred way to block a particular alias when you have a wildcard at your own domain?
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Or is there a better way? Thanks.
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Yes, I made that post. See:
https://www.emaildiscussions.com/showthread.php?p=568760#post568760
But that was over six years ago, and Fastmail has greatly changed over that period. Now there is a direct way of
disabling a particular alias at your domain:
- Go to the Aliases screen.
- Edit the alias you wish to block.
- Enable this setting for that alias:
Quote:
Reject (bounce) all mail sent to this address (disable the alias)
Disable a specific address when you have a wildcard (catch-all) alias.
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If messages arrive for that alias, it will appear that it does not exist. This does not generate a "bounce" email to the From address. Instead, that particular alias no longer exists at the domain, so the sending email server will typically generate a
550 SMTP error such as:
Quote:
550 5.1.1 <blocked@example.com>: Recipient address rejected: User
unknown in virtual mailbox table via compute1 (in reply to end of DATA command)
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After blocking certain aliases in this manner from a domain with a wildcard alias, there are three possible conditions:
- Messages sent to aliases which are blocked in this manner will generate a 550 SMTP error, since that email address is invalid. This error will appear in the sending server and will not bother any spoofed From address set by a spammer.
- Messages sent to listed aliases which are not blocked will be delivered to the delivery address specified in the alias screen.
- Messages sent to any other alias will be delivered to the Inbox (unless a rule or plus or subdomain address changes the target folder).
I hope this helps. There is no need to use that old trick I described many years ago before the alias feature was improved.
Bill