I tried to set up Solr search server according to http://wiki2.dovecot.org/Plugins/FTS/Solr, and turned on autoindexing according to http://wiki2.dovecot.org/Plugins/FTS, but I found a strange behaviour that cause server search missing some emails.

Here is the login information of my mail server:
login name: user1
email: us...@example.com

Now, when I turned on autoindexing, all autoindexed email are indexed using us...@example.com as username key, as shown in maillog:

dovecot: [ID 12345 mail.info] indexer-worker(us...@example.com): Indexed 1 
messages in INBOX

But when I triggered on-demand indexing using IMAP server search, the emails are indexed using user1 as username key instead, as shown in maillog:

dovecot: [ID 12345 mail.info] indexer-worker(user1): Indexed 1799 messages in 
INBOX

Only the emails indexed using user1 can be searched, emails indexed using us...@example.com cannot be found. How can I configure autoindex to index email using user1 as username key?

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(Below is a follow-up question)

In my mail server config, there are a few virtual mailbox users are using the following login information instead (different auth/password backend):
login name: us...@virtmail.example.com
email: us...@virtmail.example.com

In this case, how can I distinguish us...@example.com and us...@virtmail.example.com, so that emails for us...@example.com can be indexed using user1 as username key, while us...@virtmail.example.com can be indexed using us...@virtmail.example.com as username key?

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