To add mailboxes to Lemlist do the following:
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Go to your profile and click "Settings":

Go to "Sending settings" and click "Connect new email addresses":

Choose "Other email provider (SMTP/IMAP)":

Log in with your details and click "Save changes":

To add more mailboxes, click "Connect new email addresses":

Comply with Lemlist Terms of Service:

Please note that depending on the Lemlist plan that you have, you can connect:

➡️Email Pro Plan - you can connect up to 3 Sending email addresses

➡️ Multichannel Expert Plan - you can connect up to 5 Sending email addresses

➡️ Outreach Scale Plan - you can connect up to 15 Sending email addresses