Decide whether an email is the right move at all
Most internship applications happen inside an employer portal, and an email does not replace one. Email is the right tool when a posting names a contact, when a stated decision date has passed, when you are asking a professor about research, thanking an interviewer, answering an offer, or asking a small organization with no application system whether it takes interns. It is the wrong tool when the employer says not to contact recruiters, or when you would be sending the same message to dozens of addresses you found online. One specific email to the right person does more than fifty generic ones, and it is the only kind worth sending.
Following up after you applied
Wait until the stated decision date has passed — or a few weeks if none was given — then write to the recruiter handling your application or the applicant contact the employer publishes. Template: ‘Subject: Application follow-up — [role title, requisition ID]. Hello [name], I applied for the [role title] internship ([ID]) on [date]. I remain very interested in the role and wanted to ask whether there is anything else you need from me. Thank you for your time. [Your name], [university], graduating [month and year].’ Send it once. If there is still no reply, put your effort into other applications; our follow-up guide covers the rest.
Asking about an internship when none is posted
This works best with smaller organizations — labs, local businesses, nonprofits, startups — that hire informally and publish a general contact. Write to one organization at a time, to a published address or to a named person whose role makes them the right contact, and include something that is only true of them. Template: ‘Subject: Summer internship inquiry — [your field], [university]. Hello [name], I am a [year] studying [major] at [university]. I have been following [specific project, product or piece of work] and am particularly interested in [one concrete aspect]. I would like to ask whether [organization] takes undergraduate interns for summer [year]. Last semester I [one relevant thing you did, with its result]. My resume is attached in case it is useful. Thank you for considering this. [Your name]’ If the answer is no, thank them anyway.
Emailing a professor about undergraduate research
Read at least one recent paper or project summary from the lab before writing, and name what specifically caught your attention — faculty can tell at once whether a message was written for them. Some research programs actively suggest contacting investigators, and NIH's Summer Internship Program is one; others ask applicants not to, so follow the program's own instructions where there is one. Template: ‘Subject: Undergraduate research interest — [topic]. Dear Professor [name], I am a [year] in [major] at [university]. I read [paper or project] and was interested in [specific finding or method], particularly [your question about it]. I have completed [relevant courses or skills] and would like to ask whether you take undergraduate researchers in your group. I would be glad to meet if that is helpful. Thank you, [name]’ Keep it short enough to read on a phone.
A thank-you note after an interview
Send it the same day or the next, to the people who interviewed you, and mention one specific thing from the conversation so it could not have been written in advance. It is a courtesy rather than a deciding factor: it will not rescue a weak interview, and leaving it out rarely sinks a strong one. Template: ‘Subject: Thank you — [role] interview. Hello [name], thank you for speaking with me today about the [role] internship. I especially enjoyed hearing about [specific project or detail], and it made me more interested in [aspect of the work]. Please let me know if I can provide anything else. Best regards, [name]’ If the employer's process asks candidates not to contact interviewers, follow that instead.
Asking for a recommendation letter
Ask at least three to four weeks before the deadline, and make it easy for the person to say no — a reluctant letter is worse than a different referee. Template: ‘Subject: Recommendation request — [program], due [date]. Dear Professor [name], I am applying to [program], which asks for a letter from someone familiar with my work. I took your [course] in [term], where I [specific work]. Would you be comfortable writing a letter for me? The deadline is [date], and I can send the program description, my resume and a short summary of what I worked on in your class. Thank you for considering it. [Your name]’ Our recommendation-letter guide covers what to send once they agree.
Accepting, declining, or asking for more time on an offer
Reply promptly and in writing, and keep the tone the same whatever you decide, because you may want to apply to this employer again. To accept: ‘I am delighted to accept the offer for the [role] internship. Please let me know the next steps.’ To decline: ‘Thank you for the offer. After careful consideration I have decided to accept another position, and I hope our paths cross again.’ To ask for time: ‘Thank you for the offer. I am very interested and expect to hear from another program by [date]. Would it be possible to give you my answer by [date]?’ Ask for an extension once, with a specific date, and never accept an offer you already intend to back out of.
Subject lines, timing and format
Put the purpose and the specifics in the subject line — role, requisition ID, program or topic — so the message can be found again later. There is no reliable best hour to send; a weekday during working hours in the recipient's time zone is a sensible default, and reaching the right person with the right detail matters far more than the timestamp. Use a plain, professional address, write in the body of the email rather than in an attached letter unless one is requested, give any attachment a clear file name, and check every name and title twice. A message that fits on one phone screen tends to get read.
What not to do
Do not send the same email to many people at once, write to addresses scraped or guessed from a website, or follow up more than once without a reply. Do not ask a recruiter to check on an application the portal already tracks, attach files nobody asked for, or claim a connection you do not have. And never pay a service that promises to email employers on your behalf or to guarantee responses — nobody can guarantee a reply, and bulk outreach is easy for employers to recognize and rarely read.
A practical starting point
The shape of a useful internship email — adapt it, don't copy it
Subject: [purpose] — [role, ID, program or topic] Greeting: [name and title] Who you are: one line — year, major, university. Why them: one sentence that is only true of this person or organization. The ask: one clear question. Evidence: one relevant thing you did, with its result. Close: thank them; your name, university and expected graduation.
This is editorial guidance, not an employer-required format. Use true details, respect authorship rules, and follow the actual application prompt.
Check the program-specific instructions
Use these independent guides to find the official requirements and application route. General advice does not override a publisher's instructions.
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