Thank you David and Chris, I appreciate your replies. Fortunately, I did
actually manage to solve this virtual user authentication issue. However, it
seems there is still some issue that prevents Thunderbird from being able to
download mail from imap.
First the matter of the multiple database authentication issue. My `doveconf`
remains the same as when I last reported it. The major changes were in my
postfix login map and my passwd-file for the virtual mailbox. In
`/etc/postfix/main.cf` I have `smtpd_sender_login_maps =
pcre:/etc/postfix/login_maps.pcre`. In that file, I previously only had the
first line for my main domain and I had to add a second for the hosted domain:
```
/^(.*)@example\.com$/ ${1}
/^(.*)@example\.net$/ ${1}@example.net
```
For some reason this is required to get postfix to recognize that accounts from
`example.net` are valid, or to otherwise be handed off to authentication
properly. The other mistake was in my passwd-file at
`/etc/dovecot/passwd/example.net` where I did not properly specify the password
format:
`[email protected]:{crypt}...long..hash...::/var/postfix/virtual/example.net/user::`
With these changes, I am able to login to Thunderbird as `[email protected]`. I
can send mail from `[email protected]`, and allegedly look at my mailboxes on
the server for this user. However, due to some weird quirk I cannot actually
collect mail from my inbox on the server.
For `[email protected]`, who is a linux user with a home directory, this is
seemingly no problem and their mailbox is set up according to the configuration:
```
/home/user/
Mail/
Inbox/
mailboxes/
...indexes and logs...
```
However our virtual mailbox for `[email protected]` looks like this:
```
/var/postfix/virtual/example.net/user/
Mail/
Inbox/
mailboxes/
...indexes and logs...
cur/
mailboxes/
new/
tmp/
subscriptions
...indexes and logs...
```
Clearly dovecot is trying it's best to make the Mail directory as defined in
the conf for the virtual user in their defined home. However, the mail is
instead delivered to the `new` directory which is not configured to be there.
This confirms this user is actually recieving all mail sent to it, but because
the inbox is not configured correctly (somehow) it is not possible to actually
read it in Thunderbird.
>From what I've read this pattern (cur, new, and tmp directories) is associated
>with Maildir, which is confusing because the mail_driver is explicitly set to
>`sdbox`. I am not sure how to resolve this, or where exactly the issue is
>being caused.
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