In Chapter 19 we discussed how Internet protocol replies are captured in a class hierarchy. However, replies may vary within a single protocol to catch additional command-specific information. In particular, SMTP protocol replies are abstracted as shown below:
RWISmtpReply and its derived class RWISmtpDataReply contain an encapsulation of the standard SMTP protocol reply messages.
RWISmtpReply contains general SMTP replies.
RWISmtpDataReply has an additional RWSocketPortal for the data transfer operation that is typical of the dataOpen method.
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