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	this connection originated from IPv4. this means one of:
	  - the source does not have IPv6 connectivity (try to fix that!)
	  - the source has IPv6 connectivity, but preferred IPv4 for some reason (fix that!)
	  - something on the server broke severely (e-mail user "sys" on 31a05b.net)

	in any of the three cases: this must be fixed. help IPv4 rest in peace

	[more text should be added in the future. this is a placeholder]

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