收到留学offer后，回复邮件通常遵循以下步骤和格式：
确认接受或拒绝
如果决定接受offer，通常需要先回复邮件表示接受。
如果决定拒绝offer，将邮件中的“接受”改为“拒绝”即可。
提供必要信息
对于无条件offer，你可能需要提供个人信息，如护照信息，并可能需要缴纳押金。
对于有条件offer，确保满足所有条件后再进行回复。
遵循offer中的指示
确认offer邮件中关于如何确认接受的具体指示，可能是电子邮件形式或邮寄形式。
表达感谢
在邮件中表达对offer的感激之情。
询问后续步骤
如果有任何疑问，可以询问关于注册、缴纳学费、住宿安排等后续步骤。
接受offer回复邮件示例：
```
Subject: Acceptance of Offer - MSMAPHD in XX major, XXX地点
Dear [Professor's Name],
I am writing to express my gratitude for the offer of admission to the MSMAPHD program in the XX major at XXX地点. I am delighted to have been accepted into such a prestigious institution and look forward to the opportunity to study and grow with the esteemed faculty and fellow students.
Please let me know what the next steps are in the admission process, including any necessary documentation or payments required. I am eager to comply with all the requirements and begin my academic journey at [University Name] as soon as possible.
Thank you again for this opportunity. I am ready to provide any further information required.
Best regards,
[Your Name]
```
请根据具体情况调整邮件内容，并确保遵循offer中提供的所有指示。