User is only found if globed at the end:

[root@www conf.d]# dovecot --version 2.2.10 [root@www conf.d]# cat /etc/accounts test@example.com:{CRYPT}pEZfBPqH83Nuo [ root@www conf.d]# doveadm user "test@example.com" field valueuserdb lookup: user test@example.com doesn't exist

[root@www conf.d]# doveadm user "test@examplel.com*" test@example.com

[root@www conf.d]# file /etc/accounts /etc/accounts: ASCII text