Christian Heimes added the comment:
RFC 2821 says:
command line
The maximum total length of a command line including the command
word and the <CRLF> is 512 characters. SMTP extensions may be
used to increase this limit.
reply line
The maximum total length of a reply line including the reply code
and the <CRLF> is 512 characters. More information may be
conveyed through multiple-line replies.
text line
The maximum total length of a text line including the <CRLF> is
1000 characters (not counting the leading dot duplicated for
transparency). This number may be increased by the use of SMTP
Service Extensions.
I suggest a response limit of 2048 octets (that is four times the max limit) to
be on the safe side for a bugfix release.
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<http://bugs.python.org/issue16042>
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