Что это такое в логах?

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Вот, дня три как в логах CGP стало появляться вот такое:

14:45:01.16 1 ROUTER failed to route 'operator@centerit'
14:45:01.16 1 SMTPI-00479([127.0.0.1]) Recipient operator@centerit rejected: failed to route the address
14:45:01.16 4 SMTPI-00479([127.0.0.1]) rsp: 551 operator@centerit failed to route the address
14:45:01.16 4 SMTPI-00479([127.0.0.1]) cmd: DATA
14:45:01.16 4 SMTPI-00479([127.0.0.1]) rsp: 554 no valid RCPT address specified
14:45:01.25 4 SMTPI-00479([127.0.0.1]) cmd: RSET
14:45:01.25 4 SMTPI-00479([127.0.0.1]) rsp: 250 SMTP state reset
14:45:01.40 4 SMTPI-00479([127.0.0.1]) cmd: RSET
14:45:01.40 4 SMTPI-00479([127.0.0.1]) rsp: 250 SMTP state reset
14:45:01.40 4 SMTPI-00479([127.0.0.1]) cmd: MAIL From:<> SIZE=2329
14:45:01.40 4 SMTPI-00479([127.0.0.1]) rsp: 250 <> sender accepted
14:45:01.40 4 SMTPI-00479([127.0.0.1]) cmd: RCPT To:<postmaster@centerit>
14:45:01.40 1 ROUTER failed to route 'postmaster@centerit'
14:45:01.40 1 SMTPI-00479([127.0.0.1]) Recipient postmaster@centerit rejected: failed to route the address
14:45:01.40 4 SMTPI-00479([127.0.0.1]) rsp: 551 postmaster@centerit failed to route the address
14:45:01.40 4 SMTPI-00479([127.0.0.1]) cmd: DATA
14:45:01.40 4 SMTPI-00479([127.0.0.1]) rsp: 554 no valid RCPT address specified
14:45:01.50 4 SMTPI-00479([127.0.0.1]) cmd: RSET
14:45:01.50 4 SMTPI-00479([127.0.0.1]) rsp: 250 SMTP state reset
14:45:01.62 4 SMTPI-00479([127.0.0.1]) cmd: QUIT
14:45:01.62 4 SMTPI-00479([127.0.0.1]) rsp: 221 papatramp.com CommuniGate Pro SMTP closing connection

Что это? Что/кто шлет или пытается слать?

-- 
Best regards,
 Andrey                            mailto:papatramp@papatramp.com