Install librbl1 by entering the following commands in the terminal:
sudo apt update sudo apt install librbl1
Description:
Library to support a DKIM based RBL system
The OpenDKIM Project is a community effort to develop and maintain a C library for producing DKIM-aware applications and an open source milter for providing DomainKeys Identified Mail (DKIM) service. . This package provides library for implementing OpenDKIM's RBL system.
Homepage: http://www.opendkim.org/
Version: 2.11.0~alpha-11build1
Section: universe/libs