InMails are LinkedIn's unique form of premium messages that allow you to talk to users outside of your network. They are incredibly powerful since they allow you to directly engage users that you are not connected with and build exciting new opportunities.

While they are mostly a LinkedIn Premium feature, there are actually two types of InMails:

LinkedIn's Premium plans offer users to send a limited number InMails each month, depending on their plan. InMail credits are a valuable currency that resets every month.

Aimfox never uses your Paid InMails.

Every Premium account on LinkedIn can opt-in to receive an InMail from ANY LinkedIn user, regardless if they're on a paid LinkedIn plan. This allows free accounts to contact these users, and lets paid accounts save their limited InMail credits.

This is the type of InMails Aimfox uses.

Every Aimfox campaign offers the option of using "InMail Optimization". This automatically finds all targets in your campaign that are open to receiving a Free InMail, and contacts them that way, instead of using your weekly connection or message requests.

Additionally, you have the flexibility to create an InMail-only campaign by setting your primary interaction to OFF during campaign creation.

If you do that, the campaign will only send InMails to open profiles, and won't use up any of your connection or message requests.

For further insights into how InMails function from LinkedIn's perspective, you can explore this LinkedIn Help Center article.