[Techtalk] Postfix Virtual Domain Configuration Driving Me Nuts

[Kagan MacTane]

I'm at my wits' end with my Postfix configuration. I have machine whose 
canonical name is brain-like-a-sieve.wandererblue.com. I have a variety 
of historical/legacy domains, addresses, and users here, and I'm trying 
to migrate off of one domain in particular.

Up until now, I've had the following situation: mail for kai at mactane.org 
and kagan at mactane.org go to the user kmactane's inbox. Mail for 
digitalsidhe at silmemar.org goes to user digitalsidhe's inbox. And I set 
up the new wandererblue.com domain, making it the canonical/default 
domain in DNS. Email to wanderer at wandererblue.com and 
wb at wandererblue.com go to user wanderer's inbox.

(If it matters, these inboxes are all Maildirs owned by user accounts on 
the machine, available via IMAP and POP3.)

I'm trying to get rid of the silmemar.org domain. I'd like to have email 
to anything @mactane.org go to the kmactane inbox, have email to 
digitalsidhe at wandererblue.com go to the digitalsidhe inbox, and have 
anything else @wandererblue.com go to the wanderer inbox. This would 
mean kagan at wandererblue.com goes to wanderer, while kagan at mactane.org 
goes to kmactane.

What I've actually got, instead, is that kagan at mactane.org is going to 
wanderer, which is annoying because I have a lot of IMAP folders set up 
on the kmactane inbox and don't want to migrate them. Also, I'm getting 
messages in the log:

     Apr  2 21:08:49 brain-like-a-sieve 
postfix/trivial-rewrite[3935407]: warning: do not list domain
     wandererblue.com in BOTH mydestination and virtual_alias_domains

However, if I remove wandererblue.com from mydestination, I can no 
longer receive email for kagan@ anything at all; I then get items like this:

     Apr  2 21:07:45 brain-like-a-sieve postfix/error[3935328]: 
4A355420097: to=<wanderer at wandererblue.com>,
     orig_to=<kagan at mactane.org>, relay=none, delay=0.32, 
delays=0.31/0/0/0, dsn=5.1.1, status=bounced (User
     unknown in virtual alias table)

Here is what I hope are the relevant portions of my main.cf file; I can 
send the whole thing if it will help:

    myhostname = brain-like-a-sieve
    mydomain = wandererblue.com
    alias_maps = hash:/etc/postfix/aliases
    alias_database = hash:/etc/aliases

    mydestination = localhost.$mydomain, localhost.localdomain,
    localhost, wandererblue.com
    # The following line removes the warning, but doesn't deliver mail.
    #mydestination = localhost.$mydomain, localhost.localdomain, localhost

    virtual_alias_domains = hash:/etc/postfix/primary-domains
    virtual_alias_maps = hash:/etc/postfix/virtual

    local_recipient_maps = unix:passwd.byname $alias_maps

The /etc/postfix/primary-domains file does have wandererblue.com in it, 
along with the other domains. All of the following lines (as well as 
many others) appear in /etc/postfix/virtual, and I have run "postmap 
/etc/postfix/virtual" and "/etc/init.d/postfix reload".

    mactane.org                                   DOMAIN
    kai at mactane.org                          kmactane
    kagan at mactane.org                     kmactane

    silmemar.org                                   DOMAIN
    digitalsidhe at silmemar.org           digitalsidhe
    kagan at silmemar.org                     digitalsidhe

    wandererblue.com                         DOMAIN
    kai at wandererblue.com                wanderer
    kagan at wandererblue.com           wanderer

    digitalsidhe at wandererblue.com digitalsidhe
    ds at wandererblue.com                  digitalsidhe

    wanderer at wandererblue.com     wanderer
    wb at wandererblue.com                 wanderer

I can't figure out what's happening. It seems like any mail I try to 
direct to kmactane winds up in wanderer's inbox instead.

I'll be very grateful for any help. Please let me know if you want me to 
send full files, log output, or anything else. Thank you very much.

-- 
Kagan MacTane
(he/him/his)