Bahnhof blocks SMTP

Swedish internet provider Bahnhof seems to be blocking outgoing SMTP connections. wtf?

14:32:10.650068 IP > Flags [S], seq 2488790664, win 65535, options [mss 1460,nop,wscale 1,nop,nop,TS val 149635633 ecr 0,sackOK,eol], length 0
14:32:10.653313 IP > ICMP host unreachable – admin prohibited filter, length 36

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