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SMTP (Simple Mail Transfer Protocol) allows a total of 128 ASCII characters, which includes the standard printable characters (from space to tilde) as well as control characters. However, the actual envelope and header lines are limited to 7-bit ASCII, meaning only the first 128 characters can be used. Each line in an SMTP message is also limited to 78 characters for headers, with a maximum size of 10,000 bytes for the entire message.

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2mo ago

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