处理这个问题，介绍一个经典的解决方案，即对特定字符进行编码。具体步骤为在‘From’头部中使用 Python的urllib.quote方法，将特殊字符转换为可用的编码形式。在此基础上，使用Boto3 SES API实现邮件转发功能。

以下是相应的代码示例：

import boto3
import urllib

ses = boto3.client('ses',region_name='us-west-2')

original_message = {'Subject': {'Data': 'Test'},
                    'Body': {'Text': {'Data': 'This is a test message with attachment.'}}
                   }

source = 'original.sender@example.com'
destination = 'destination@example.com'

# Perform the encoding if necessary
from_name = 'OriginalNAME '
from_encoded = urllib.quote(from_name.encode('utf-8'))

# Use the encoded string as the 'From' header
original_message['Source'] = from_encoded

# Set up the attachment, read from file and encode using base64
with open('/path/to/attachment.pdf', 'rb') as f:
    att = f.read()
    att_encoded = base64.encodestring(att)
    attachment = {'Name': 'attachment.pdf',
                  'Data': att_encoded
                 }

    # Add the attachment to the message as a MIME type
    original_message['Body']['Attachments'] = [attachment]

# Call SES to forward the email
response = ses.send_raw_email(
    Source=source,
    Destinations=destination,
    RawMessage={
        'Data': original_message
    }
)

该代码示例展示了如何使用urllib.quote方法对特殊字符进行编码，并如何将邮件附件添加到Boto3 SES API的消息中。