On Tue, Jul 30, 2024 at 12:23:43PM +1000, Phil Steel-Wilson via Postfix-users 
wrote:

> because it has received a number of bounces indicating that there may
> be a problem delivering messages top...@philfixit.info.

Trying "sendmail -bv top...@philfixit.info" to verifying your address, I see:

On Tue, Jul 30, 2024 at 12:50:13PM +1000, Mail Delivery System wrote:

> <top...@philfixit.info>: delivery via mail.philfixit.info[203.45.14.55]:25:
>     host mail.philfixit.info[203.45.14.55] said: 554 5.1.1
>     <top...@philfixit.info>: Recipient address rejected: User unknown in
>     virtual alias table (in reply to RCPT TO command)

So your server is misconfigured, and rejects the address you're
attempting to subscribe with.

> Final-Recipient: rfc822; top...@philfixit.info
> Original-Recipient: rfc822;top...@philfixit.info
> Action: undeliverable
> Status: 5.1.1
> Remote-MTA: dns; mail.philfixit.info
> Diagnostic-Code: smtp; 554 5.1.1 <top...@philfixit.info>: Recipient address
>     rejected: User unknown in virtual alias table

-- 
    Viktor.


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