Here be dragons.

Contact:
My KTH-Social page
e-mail:p1ersson - kth.se
XMPP:gud - kth.se
WT.social:https://wt.social/gi/johan-pettersson2/work/fo4l
Webchat:Keybase
Matrix:@p1ersson:matrix.org
WebRTC:Jitsi
Steam:Steam
Mastodon:Mastodon

I don't understand sendmail.cf at all.