BatchingOptions not working

[dvRox84]

Package version 4.0.0

This is a piece of my appsettings.json:

"WriteTo": [
{
"Name": "Email",
"Args": {
"options": {
"from": "services@mymail.com",
"to": [ "someguy@mymail.com" ],
"host": "myhiddensmpturi",
"port": 25,
"subject": "oops",
"connectionSecurity": "None"
},
"batchingOptions": {
"batchSizeLimit": 10,
"period": "00:05:00"
},
"restrictedToMinimumLevel": "Warning"
}
},
..

I'm trying to limit number of mail sent but batching options seems not to work.
When I run my app creating severeal errors, I receive 1 mail for each error.
I cannot understand how to properly configure my appsettings in order to get it works.