User is only found if globed at the end

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User is only found if  globed at the end:

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

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

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