Email Issue

hello everyone and thanks for the help in advance,

so i didnt input any emails for my clients or providers since we use akaunting internally,
and my email settings i have tried a docen times to leave them in blank but it keeps resetting.
but the issue and i have no clue as to why, but it emails our own server multiple times (probably cause of forwarding) and thats making our email server to collapse since it has a mail limit per hour..
any ideas on how to avoid emailing all together??