There was prayer webmail, but doesn't seem available anymore. That was the previous URL :
http://www-uxsup.csx.cam.ac.uk/~dpc22/prayer/ (used to be mentionned by suckless people : https://lists.suckless.org/wiki/1506/1847.html) I also like the old style of squirrelmail, not packaged under OpenBSd but who might work.
