给留学教授发邮件时，应当注意以下几个要点：
选择合适的邮箱
可以使用Gmail、Hotmail，或者是学校分配的带有学校名称后缀的邮箱。
称呼
如果对方地位较高（如教授、导师），建议使用“Dear [Last Name]”或“Dear Professor [Last Name]”。
对于熟悉的同学，可以使用“Hi [Last Name]”或“Hello [Last Name]”。
邮件结构
电子邮件通常包括标题、称呼、正文和落款。
标题应简明扼要，说明邮件的主要目的。
称呼后应留空行，并添加适当的问候语。
在问候语后，应写下自己的姓名、学校、专业和课程信息。
正文应简洁明了，说明邮件的目的和具体请求。
邮件主题
主题应简单明了，能够快速传达邮件的核心内容。
避免使用过于花哨的符号或过长的主题，以免影响收件人阅读。
结束语
在邮件结尾可以使用“Best regards,”或“Sincerely,”等礼貌用语。
最后，别忘了签上自己的名字。
示例邮件
```
Subject: Request for Meeting Regarding Research Project
Dear Professor [Last Name],
I hope this email finds you well. My name is [Your Name], and I am a student in the [Your Department] at [Your University]. I am writing to request a meeting to discuss my research project titled “[Project Title]”.
I believe that your expertise in [Related Field] would be invaluable to the success of my project. The purpose of this meeting is to discuss the current progress of my research and to seek your guidance on several aspects of the project.
Could we possibly arrange a time that works for you next week？ I am available on [Your Availability]. Please let me know if there is a preferred method of communication （e.g., phone, video conference, email）.
Thank you very much for considering my request. I look forward to hearing from you soon.
Best regards,
[Your Name]
[Your University]
[Your Contact Information]
```
通过遵循以上建议，你可以撰写出专业且得体的留学教授邮件。