PO e-mail sender e-mail ID is not correct in SOST

Hello All,

Issue - When PO sent out through e-mail, SOST shows incorrect sender user name. Although e-mail ID is correct. Incorrect user name and correct user name (which we are expecting) has same e-mail ID in user master. Checked and found that these two users are not linked at all except they have the same e-mail ID. Is this issue with SOST or Output Program?

Thanks,

Sagar