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smtpserver DOS

This is rather silly case but I've recently been bitten by it more
than once.

When remote client comes in, receives 5xx of 4xx code but ignores it and
continues to push data (esp. binary data), smtpserver's log is filled
up by "550 Syntax error" messages causing fast consumation of disk space.

Possibly repeating messages could be filtered out a la syslog?
Or maybe smtpserver should just drop connection after some threshold?