I would like to know where to find the source code of exim4, with specific version and revision, 4.89-2+deb9u4.
I have executed
apt-get source but got an error message:
apt-get source exim4=4.89-2+deb9u4
E: Can not find version '4.89-2+deb9u4' of package 'exim4'
E: Unable to find a source package for exim4
For various other revisions of exim4, I was able to find the source code in this way.
I also found the source repository but it only has the source code of exim4 version 4.89-2+deb9u3~bpo8+1 and 4.89-2+deb9u5, not for 4.89-2+deb9u4.
Does it mean the source code of 4.89-2+deb9u4 is no longer available? Or is there any way to get it?