info@ and mail@ are called "Role-based emails".
Because role-based and reserved email addresses often represent multiple recipients, they generate many spam complaints. To prevent unnecessary spam complaints, List Detective restricts these email addresses on imports and doesn’t send email to reserved email addresses.
You can use Custom List Detective to overcome this:
CLD can also be used to ALLOW sending to users or domains blocked by
the system due to the List Detective feature. List Detective by
default includes a wide array of common rule/role based email
addresses such as info@, support@, admin@ for example, as well as
explicit words and spam like names such as @spam.
See here for more details:
Use Custom List Detective to restrict sending to addresses or domains in Marketing Cloud