Install libdkim1d by entering the following commands in the terminal:
sudo apt update sudo apt install libdkim1d
Description:
cryptographically identify the sender of email
DomainKeys Identified Mail (DKIM) defines a domain-level authentication framework for email using public-key cryptography and key server technology to permit verification of the source and contents of messages by either Mail Transport Agents (MTAs) or Mail User Agents (MUAs). . libdkim is a library, developed by Alt-N Technologies, that allows incorporating DKIM into an existing MTA or other application. It provides full support for signing, verifying, and SSP. See the changelogs for information on compliance with specifications.
Homepage: http://libdkim.sourceforge.net
Version: 1:1.0.21-4build1
Section: universe/libs