Internet email is not a perfect, homogeneous system. Mail may become
corrupted at several stages in its travel to a final destination.
Specifically, email sent throughout the Internet may travel across
many networking technologies. Many networking and mail technologies
do not support the full functionality possible in the SMTP transport
environment. Mail traversing these systems is likely to be modified
in order that it can be transported.
There exist many widely-deployed non-conformant MTAs in the Internet.
These MTAs, speaking the SMTP protocol, alter messages on the fly to
take advantage of the internal data structure of the hosts they are
implemented on, or are just plain broken.
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