No proper reply from professor after acceptance I had applied for an academic internship after my undergraduate studies. The professor has accepted me for the internship. But since then he has not properly replied to my emails. I need his letter for VISA purposes. How should I write an email to him asking for the same? I had sent an email to him regarding this but he has not replied to the email. The problem is that I can't write a proper email and also he is the director of the institute and is probably very busy.

Could you please help me with writing such an email. Also I am taking a year gap for this internship, so this is extremely important to me. I also want to convey him that this internship is extremely important to me.
I think the problem is not with the content of the email itself, but rather with the fact that the professor is busy -> doesn't respond to emails consistently. Therefore, you should somehow try to attract his attention/the attention of others if he is unavailable. Possible options include: 


Having a clear email subject (e.g. a reply to the thread where you discussed your acceptance; mentioning that your request is related to the visa application, etc.)
Trying to call/email the department to establish ties with them. They may be able to assist you with the process &amp; in some cases even write the letter for you.
Trying to reach other people in the lab. They can tell you whether the professor is away and whether there is a better way to reach him. Some of the other lab members may be international as well and, therefore, can provide you with additional information regarding the visa &amp; your life post arrival.


Finally, it is likely that the professor is currently conferencing/vacationing. If none of the above helps, your best bet might be waiting and emailing again toward the end of the summer. It's no fun but delaying the start of your internship is better than not having one at all. In all of your communications, be polite and patient. That's the key to getting someone to help you. Good luck!