klyn.mails.MimeBodyPart.attachmentBase64
method

    public static attachmentBase64(fileName as String, base64Content as String) as MimeBodyPart:

Description

Creates an attachment from Base64 content.

Use this helper when the payload is already available as Base64 text. This is the operational path for binary attachments until byte-oriented file I/O is fully stabilized in the runtime.

    import klyn.mails

    part = MimeBodyPart.attachmentBase64("archive.bin", "AQID", "application/octet-stream")
    print(part.transferEncoding)