Once a post is deleted in Yammer, it is generally considered permanently removed and cannot be recovered through standard user functions. Yammer does not provide an option for users to restore deleted posts. This is important to keep in mind when sharing information, as users should be careful about what they delete. However, it is worth noting that administrators may have additional tools and access to data retention policies that could potentially assist in recovering certain types of content, depending on the organization's settings and compliance requirements. Users seeking assistance may want to consult their Yammer admin for more information on this topic. For further guidance or detailed features, checking the current web page related to Yammer would be beneficial.