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Нема измена во големината, пред 4 години
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* Sara Radicati, ''Electronic Mail: An Introduction to the X.400 Message Handling Standards'', Mcgraw-Hill, ISBN 0-07-051104-7.
* John Rhoton, ''Programmer's Guide to Internet Mail: SMTP, POP, IMAP, and LDAP'', Elsevier, ISBN 1-55558-212-5.