Thank you once again, Viktor. I have double checked RFC 2033, and you are 
correct. So Postfix is now working correctly, and I will turn my attention to 
Dovecot.

Herb

> On Mar 31, 2025, at 9:41 PM, Viktor Dukhovni via Postfix-users 
> <[email protected]> wrote:
> 
> On Mon, Mar 31, 2025 at 09:33:13PM -0700, Herb Weiner wrote:
> 
>> Now I am getting different error messages:
>> 
>> 2025-03-31T21:12:40.600768-07:00 Pluto postfix/local[5485]: F1FF52B407F4: 
>> passing <[email protected]> to transport=lmtp
>> 2025-03-31T21:12:40.633307-07:00 Pluto postfix/lmtp[5486]: 540C42B4125B: 
>> to=<[email protected]>, relay=pluto.wiskit.com[private/dovecot-lmtp], 
>> conn_use=2, delay=87874, delays=87874/0.14/0/0.07, dsn=4.3.0, 
>> status=deferred (host pluto.wiskit.com[private/dovecot-lmtp] said: 451 4.3.0 
>> <[email protected]> Temporary internal error (in reply to RCPT TO 
>> command))
> 
> That's a Dovecot configuration problem.
> 
>> 1743480760.501086 LHLO pluto.wiskit.com
>> 1743480760.501222 MAIL FROM:<[email protected]> BODY=8BITMIME
>> 1743480760.501222 RCPT TO:<[email protected]>
> 
> This is correct.
> 
>> 1743480760.501250 250 2.1.0 OK
>> 1743480760.501855 451 4.3.0 <[email protected]> Temporary internal error
>> 1743480760.501875 503 5.5.0 No valid recipients
>> 
>> I believe that Postfix should be sending rcpt to:<herbw> rather than
>> rcpt to:<[email protected]>. However, I don't know why Postfix is
>> sending the incorrect command, or how to fix it. Thank you for any
>> further assistance you can provide.
> 
> You're mistaken, just the local part is not a valid address for anything
> other than "postmaster".  Dovecot is not configured correctly.  It needs
> to be able to accept mail for a suitable <user@domain> syntax, and
> you can then configure Postfix to rewrite recipients to the desired
> domain if necessary.
> 
> -- 
>    Viktor.
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