When your partners have a new lead for you, they can push them directly to your lead management system by simply sending an e-mail to your account. It will create the lead as 'unassigned' for the admin to assign it to a sales rep.
They can even add the tag #partner automatically from the e-mail so that you know it’s coming from a partner, and also #nameofthepartner. This is very helpful when it comes to tracking which partners generated the biggest amount of leads, or generated most revenue for you. It’s also very helpful if you have commission structures in place with partners, depending on the performance of the lead.
Remember: ensure you pre-determine a set of fields for your partners, for when they send leads across. This should match exactly what information you look to gather for each lead, which will make things easier for you in the long run (ie. less admin).