Title

Sending emails to multiple email addresses gives error message

Expected Behavior

Sending emails to multiple email addresses gives error message

Current Behavior

Sending emails to multiple email addresses gives error message

Steps to Reproduce

1. Go to Invoice
2. Click menu top right corner to email invoice
3. In "cc", "bcc" or "to" enter multiple email addresses, separated by a comma ","
4. Error message: the field "cc_mail" must contain a valid email address

Possible Solution (Optional)

In mailer_helper.php de email addresses are run through "filter_var" even though they can contain multiple email addresse separated by a comma

Context (Environment)

Comes from the Forum: https://community.invoiceplane.com/t/topic/11845