Signer Property of NotesDocument Returns Unexpected Name

I mail a signed memo into any mail-in database on MASHA/DMN Then I check Signer property of the posted memo (in target database).

It returns “MASHA/DMN” string!!!

Then I mail signed memos to VOVA/DMN and ZINA/DMN servers and check Signer property of the posted memos in target databases.

I can see my own user name as a result in that case.

What can I do with MASHA/DMN server to work with memo signature like other servers do?

Subject: Resolved

I have found out server task McAfeeAddInMgr resignes all my messages