In the /var/log/maillog file what is the difference between these 2 entries (vchkpw-submission, vchkpw-smtp)?
example: MarĀ 4 17:27:03 michael vpopmail[14701]: vchkpw-submission: (PLAIN) login success t...@domain.com:64.185.3.238 MarĀ 4 10:54:42 michael vpopmail[29027]: vchkpw-smtp: (PLAIN) login success t...@domain.com:64.57.239.114 !DSPAM:5316b90234262261610445!