System Admin Pro > SMTP Email Setup adds asterisk@ in front of sender

PBX Version: 13.0.197.28
PBX Distro: 10.13.66-21
Asterisk Version: 13.29.2
 
SMTP Server: Use External SMTP Server
Provider: Office 365
Username: test@domain.com
Password: password
 
when I click on debug and try to send a test email to anothertestaccount@domain.com, I see the following messages;
 
May 30 14:52:54 FreePBX postfix/pickup[22010]: 3CEACE199E: uid=499 from=<asterisk>
May 30 14:52:54 FreePBX postfix/cleanup[22032]: 3CEACE199E: message-id=<20210530105254.3CEACE199E@FreePBX>
May 30 14:52:54 FreePBX postfix/qmgr[22011]: 3CEACE199E: from=<*asterisk@*anothertestaccount@domain.com>, size=471, nrcpt=1 (queue active)
 
for some reason, asterisk adds "asterisk@" in front of the email address, therefore email doesn't reach.
 
Is it a bug or a configuration related issue?
 
Best,
 
Savas