For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bastianfriedrich:branches:openSUSE:Leap:15.3:Update/standard/home:bastianfriedrich:branches:openSUSE:Leap:15.3:Update.repo
zypper refresh
zypper install imap
For pool-leap-15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bastianfriedrich:branches:openSUSE:Leap:15.3:Update/pool-leap-15.4/home:bastianfriedrich:branches:openSUSE:Leap:15.3:Update.repo
zypper refresh
zypper install imap
For pool-leap-15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bastianfriedrich:branches:openSUSE:Leap:15.3:Update/pool-leap-15.3/home:bastianfriedrich:branches:openSUSE:Leap:15.3:Update.repo
zypper refresh
zypper install imap
For pool run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bastianfriedrich:branches:openSUSE:Leap:15.3:Update/pool/home:bastianfriedrich:branches:openSUSE:Leap:15.3:Update.repo
zypper refresh
zypper install imap