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// Package smtp implements the Simple Mail Transfer Protocol as defined in RFC 5321.
//
// It also implements the following extensions:
//
// 8BITMIME: RFC 1652
// AUTH: RFC 2554
// STARTTLS: RFC 3207
// ENHANCEDSTATUSCODES: RFC 2034
// SMTPUTF8: RFC 6531
// REQUIRETLS: RFC 8689
// CHUNKING: RFC 3030
// BINARYMIME: RFC 3030
//
// LMTP (RFC 2033) is also supported.
//
// Additional extensions may be handled by other packages.
package smtp
import (
"errors"
"strings"
)
// validateLine checks to see if a line has CR or LF as per RFC 5321
func validateLine(line string) error {
if strings.ContainsAny(line, "\n\r") {
return errors.New("smtp: A line must not contain CR or LF")
}
return nil
}
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