Christian Heimes added the comment:

RFC 1939 says:

   Responses in the POP3 consist of a status indicator and a keyword
   possibly followed by additional information.  All responses are
   terminated by a CRLF pair.  Responses may be up to 512 characters
   long, including the terminating CRLF.

It doesn't say anything about the length of a line in a multi-line response. 
It's reasonable to belief that 512 octets are valid, too. We could quadruple 
the limit to 2048 in order to be safe.


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