![]() The recipient mail system may reject incoming emails with attachments over a certain size.Each of these has to store the message before forwarding it on, and may therefore also impose size limits. A message will often pass through several mail transfer agents to reach the recipient.Mail systems often arbitrarily limit the size their users are allowed to submit.This is because of a number of potential limits: With MIME, a message and all its attachments are encapsulated in a single multipart message, with base64 encoding used to convert binary into 7-bit ASCII text - or on some modern mail servers, optionally full 8-bit support via the 8BITMIME extension.Įmail standards such as MIME do not specify any file size limits, but in practice email users will find that they cannot successfully send very large files across the Internet. This was developed by Nathaniel Borenstein and collaborator Ned Freed - with the standard being officially released as RFC2045 in 1996. Modern email systems use the MIME standard, making email attachments more utilitarian and seamless. ![]() When the "Attachment" user interface first appeared on PCs in cc:Mail around 1985, it used the uuencode format for SMTP transmission, as did Microsoft Mail later. In the mid 1980s text files could be grouped with UNIX tools such as bundle and shar (shell archive) and included in email message bodies, allowing them to be unpacked on remote UNIX systems with a single shell command.Īttaching non-text files was first done in 1980 by manually encoding 8-bit files using Mary Ann Horton's uuencode, and later using BinHex or xxencode and pasting the resulting text into the body of the message. Text files were emailed by including them in the message body. Originally Internet SMTP email was 7-bit ASCII text only.
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