Using any email client you can configure multiple accounts. Create a secondary account for the info@anotherCompanyName.nl account that will be used for sending. You need to make sure that this account does not remove messages from the server. This will allow the messages to continue flowing into your info mailbox.
You can select this account when you are looking to send a message out using this account, If you use Outlook 2003 or newer there is a drop down menu on the new message screen that allows you to select your account that you want to use for this message. Being able to change this on a per case basis is very important and easy.
You did not mention the client that you use but if you need additional assistance let me know and I will walk you through it.