Answer
The advantages of mailings include:
Tailored targeting for your target groups: A variety of different target group parameters and individual clustering allows you to direct your communication at precisely the right audience.
Bespoke concept: Only a few select XING partners enjoy this kind of cooperation, meaning that your campaign is one of the exclusive few.
Direct approach: Mailings are sent to XING members directly via the e-mail address linked to XING. That way you boost your reach and opening rate by reaching XING members outside of the platform.