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Limitations of SMTP/RFC 822

Explain some of the limitations of the SMTP/RFC 822?

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a) SMTP could not send the executable files or the binary objects.

b) It could not send the text data consisting of the national language characters.

c) SMTP servers can refuse the mail message on the particular size.

d) SMTP gateways results in the problems when broadcasting the EBCDIC and ASCII.

e) SMTP gateways to X.400 E-mail network could not handle the non textual data involved within the X.400 messages.

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