And i forgot...
Sorry, Postfix does not support ASCII art. Seriously, only nerds care about multiline server responses.
I want to challenge this assertion. Postfix regularly artificially adds line breaks and even truncates responses based on an arbitrary length picked by the programmer. That shows some thought into caring about response formatting does exist. If there truly is no care about multi-line responses or formatting of messages... why add line breaks after set string length where there are no line breaks in that string? Selective nerdism? :)