500 Line length exceeded. See RFC 2821 #4.5.3.1.

 

EML 원문도 잘못 되었지만 메일을 스팸 서버가 받아서 메일 엔진으로 전달 시 발생.

 

SMTP 를 통한 공격을 막기 위해 제한 했다고는 하는데 남들 다 받는데 얘만 못받으니 문제지

 

ㅁ 원인

  - Bold 로 표기된 부분이 8192 가 넘을 경우 발생한다.

 

... MIME-Version: 1.0 X-Mailer: Mymailer 3.0 Content-Type: text/html; charset=EUC-KR Content-Transfer-Encoding: base64   PGh0bWw+DQ0KPHA+DQ0KPG1ldGEgY2hhcnNldD0iVVRGLTgiIC8+PFNUWUxFIFRZUEU9InRleHQvY3NzIj4JY...

 

 

ㅁ RFC 2821 - Simple Mail Transfer Protocol

    4.5.3.1 Size limits and minimums

  http://www.faqs.org/rfcs/rfc2821.html

 

 

public abstract class AbstractChannelPipelineFactory implements ChannelPipelineFactory, ExternalResourceReleasable{ public final static int MAX_LINE_LENGTH = 8192; protected final ConnectionLimitUpstreamHandler connectionLimitHandler; protected final ConnectionPerIpLimitUpstreamHandler connectionPerIpLimitHandler; private final HashedWheelTimer timer = new HashedWheelTimer(); private final ChannelGroupHandler groupHandler; private final int timeout; private final ExecutionHandler eHandler; public AbstractChannelPipelineFactory(int timeout, int maxConnections, int maxConnectsPerIp, ChannelGroup channels) { this(timeout, maxConnections, maxConnectsPerIp, channels, null); }

 

public class SMTPSessionImpl extends ProtocolSessionImpl implements SMTPSession { private static final Response LINE_LENGTH_EXCEEDED = new SMTPResponse(SMTPRetCode.SYNTAX_ERROR_COMMAND_UNRECOGNIZED, "Line length exceeded. See RFC 2821 #4.5.3.1.").immutable(); private static final Response FATAL_ERROR = new SMTPResponse(SMTPRetCode.LOCAL_ERROR, "Unable to process request").immutable(); ... @Override public Response newLineTooLongResponse() { return LINE_LENGTH_EXCEEDED; }