Apology Email to Customers: 12 Templates for Delays, Mistakes and Outages

Apology email to customers: 12 templates for delays, mistakes and outages

An apology email to customers works when it names the problem, owns it, says what you have done about it and tells the customer what happens next, all in a few short paragraphs. Below you will find 12 ready-to-adapt templates for the situations businesses face most often (late deliveries, wrong orders, slow replies, outages, an email sent by mistake, billing errors and a data incident), plus subject lines, a compensation guide and the rules for sending an apology to many customers at once.

Key takeaways

• Say sorry in the first two lines, name the exact problem and skip vague phrases like "any inconvenience caused".
• Explain what you have already done, what the customer needs to do (ideally nothing) and when they will hear from you again.
• Offer compensation when the mistake cost the customer money, time or a missed occasion, not by default.
• Send the apology only to the customers who were affected, from an address that accepts replies.
• Never promise "this will never happen again", a fix time you have not confirmed or anything about data you have not checked.

What should an apology email to customers include?

A good apology email to customers has five parts, in this order: the apology, what happened, what you have done, what happens next and a way to reach a person. Keep each part to one or two sentences. Length is not sincerity; precision is.

1. The apology, up front. "We're sorry your order is late" beats three lines of context before the point.
2. What happened, in plain words. Name the order, the date, the invoice or the service. Give a cause only if you are sure of it.
3. What you have done. Refund issued, replacement shipped, bug fixed, charge reversed.
4. What happens next. A new delivery date, the time of the next update or the step the customer should take (if any).
5. A real contact. A monitored reply-to address, a named person or a direct link to support. A "no-reply" address on an apology undoes the apology.

Tone matters as much as content. Write the way your best support agent talks: short sentences, active voice, "we" when it is your fault. Our guide to email microcopy covers the small wording choices (button labels, preheaders, sign-offs) that make a message sound human rather than legal.

Which subject line works best for an apology email?

The best apology email subject line says what happened and that it is being handled, so the customer understands the message before opening it. Avoid clickbait, emoji and vague titles like "An update" for anything serious. Here are subject lines you can reuse:

For more on length and wording, see our guide to writing effective email subject lines. For apologies, clarity wins over cleverness every time.

12 apology email templates you can copy

Replace everything in [brackets]. Each template is an example to adapt to your brand voice, your policy and the facts of your case.

1. Apology email to customer for delay in delivery

Subject: Your order [#1234] is running late, and we're sorry

Hi [First name],

We're sorry: your order [#1234] will not arrive on [original date] as promised. [Short, confirmed reason, e.g. "One item sold out faster than our stock updated" or "Our carrier is facing delays in your area"].

Your new estimated delivery date is [new date]. You'll get a tracking link as soon as the parcel leaves our warehouse. If that date no longer works for you, reply to this email and we'll cancel and refund the order in full, no questions asked.

[Optional: To thank you for your patience, here is free shipping on your next order with code [CODE].]

Thank you for waiting,
[Name], [Company] customer care

2. Apology email to customer for delay in response

Subject: Sorry for the slow reply, [First name]

Hi [First name],

You wrote to us on [date] about [topic], and it took us far too long to answer. I'm sorry you had to wait.

Here is the answer: [clear answer or solution].

If anything is still unclear, reply directly to this email. It comes to me, and I'll get back to you by [day/time].

[Name]
[Role], [Company]

3. Apology email to customer for wrong order

Subject: We sent the wrong item. Here's the fix

Hi [First name],

You ordered [correct item] and received [wrong item]. That's our mistake, and we're sorry.

We've already shipped the right item. It should reach you by [date] ([tracking link]). You don't need to send anything back: [keep the wrong item / use the prepaid return label attached], whichever is easier for you.

If you needed the item for a specific date and this delay causes a problem, reply to this email and we'll find a solution together.

Sorry again,
[Name], [Company]

4. Apology email to customer for damaged product

Subject: Your [product] arrived damaged. A replacement is on its way

Hi [First name],

Thank you for sending the photos of your [product]. It should never have arrived like that, and we're sorry.

We've sent a replacement today, and it should arrive by [date]. [There's no need to return the damaged item. / A return label is attached.] If you'd rather have a full refund instead, just reply and say so.

We've also shared your photos with our packing team so we can look at how this happened.

[Name], [Company]

5. Service outage email (while the problem is ongoing)

Subject: [Service] is down: what we know so far

Hi [First name],

Since [time, time zone], [service/feature] has been [unavailable / slow / failing for some users]. We're sorry: we know you rely on it.

What we know: [what is affected and what still works]. Your data is [only state what has been confirmed].

What to do in the meantime: [workaround, or "nothing, we'll let you know as soon as it's back"].

Our next update will be at [time] at the latest, on [status page link] and by email.

The [Company] team

6. Service outage email (after it's resolved)

Subject: Resolved: today's [Service] outage

Hi [First name],

[Service] is working normally again since [time]. From [start time] to [end time], [what customers could not do]. We're sorry for the disruption to your work.

What happened: [one or two sentences on the confirmed cause].
What we're changing: [concrete measure, e.g. "an extra alert that pages our team within minutes"].

[If relevant: Anything you tried to do during the outage, such as [action], may not have gone through. Please check [where] and retry.]

[Optional: We've added [credit] to your account for the downtime. It will appear on your next invoice.]

If you see anything unusual, reply to this email and our team will look into it.

[Name], [Role], [Company]

An apology should only reach the people who were affected. With Mailpro™, you can build a segment of the affected customers and send the right version to each group.

7. "Oops" email: wrong link, wrong price or wrong content sent by mistake

Subject: Correction: the right link for [offer]

Hi [First name],

Oops. In our email this morning, the [button/link/price/date] was wrong. Here's the correct one: [correct link or information].

[If a wrong price was shown: Orders placed at the price shown in our email will be honoured. / The correct price is [price], and we're sorry for the confusion.]

Thanks for your patience, and sorry for the extra email.

The [Company] team

Keep an oops email short, a little lighter in tone and sent only once. If you want to see how other brands have handled (or fumbled) their own public slip-ups, our roundup of marketing email fails collects the memorable ones.

8. Email sent to the wrong list or sent twice

Subject: Please ignore our last email

Hi [First name],

A few minutes ago you received an email from us about [topic] that wasn't meant for you [or: that you received twice]. Please ignore it. There's nothing you need to do.

Sorry for cluttering your inbox.

The [Company] team

If the email you sent by mistake contained another customer's personal information, do not use this template: treat it as a data incident (template 11).

9. Billing error apology email (double charge or overcharge)

Subject: We charged you twice. It's been refunded

Hi [First name],

On [date], we charged your [card/account] [amount] twice for [order/subscription]. That was our error, and we're sorry.

We refunded the duplicate charge of [amount] today. Depending on your bank, it can take a few business days to appear on your statement. You don't need to do anything.

If you were charged any fees by your bank because of this, reply with the details and we'll cover them.

[Name], [Company] billing team

10. Apology email to customer for a bad experience

Subject: I'm sorry about your experience with us

Hi [First name],

I read your message about [what happened] on [date]. You expected [what they expected], and you got [what actually happened]. That's not the service we want to give, and I'm sorry.

Here's what I've done: [specific action, e.g. "refunded your booking", "spoken with the team member involved", "rebooked you for [date]"].

I'd like to make sure this is fully resolved for you. You can reply to this email or reach me directly at [direct contact].

[Name]
[Role], [Company]

11. Data incident notice (generic)

Subject: Important information about your [Company] account

Dear [First name],

We're writing to tell you about a security incident that may involve some of your information. We're sorry this happened.

What happened: On [date], we discovered that [brief, factual description].
What information was involved: [only the categories confirmed, e.g. name and email address]. [Information that was NOT involved, if confirmed.]
What we've done: [contained the issue, reset credentials, informed the relevant authorities where required, etc.].
What you can do: [specific steps, e.g. change your password, be careful with emails asking for personal details].

We will never ask you for your password by email. If you have questions, contact [dedicated address or page].

[Name], [Role], [Company]

A data incident notice is not a marketing email. Depending on the countries where you and your customers are, data-protection laws (such as the GDPR in the EU) may require you to notify an authority and the people affected within set deadlines, and may set what the notice must contain. Involve your legal or privacy contact before you send, and stick to confirmed facts.

12. Follow-up email after the problem is fixed

Subject: Checking in on your [order/issue]

Hi [First name],

Last week we [sent the wrong item / had an outage / made a billing error] and promised to put it right. I wanted to check: did [the replacement arrive / everything work as expected / the refund show up]?

If anything is still not right, reply to this email and I'll handle it personally.

[Name], [Company]

When should an apology email include compensation?

Add compensation when the mistake cost the customer money, time or a missed occasion; a sincere apology alone is enough for a minor inconvenience. Compensation should match the damage and be easy to use, without conditions such as leaving a review.

What should an apology email never say?

An apology email should never promise what you cannot guarantee or shift the blame to the customer. The most common mistakes:

• "This will never happen again." Say what you are changing instead.
• A fix time you have not confirmed. Give the time of the next update, not a guess at the resolution.
• "No data was affected" before your investigation confirms it.
• "We apologize for any inconvenience." Name the actual inconvenience.
• "If you were affected…" when you know exactly who was affected. Send to them and say it plainly.
• Blaming a supplier or partner as if it lets you off the hook. The customer bought from you.
• A sales pitch. No promotions, cross-sells or "while you're here" banners in an apology.

Many of these mistakes start upstream. Our list of email marketing mistakes to avoid covers the planning errors behind them.

How do you send an apology email to many customers at once?

To send an apology email to many customers, export or tag exactly who was affected, send from your email platform to that segment only and personalize the essentials (name, order number, amount). A mass apology that lands in the inbox of unaffected customers creates a second problem.

• Segment first. Build the list of affected customers from your order, billing or support data, and split it if different groups need different messages (for example "refunded" and "replacement shipped").
• Personalize the facts. Merge fields for first name, order number, dates and amounts make a bulk apology read like a one-to-one message.
• Use a plain layout. No hero banner, no promo blocks. A simple template with your logo and text looks more sincere.
• Keep the reply-to open and make sure someone reads the replies on the day you send.
• Test before you send. A broken link or wrong merge field in an apology is the worst possible follow-up. Run through our HTML email QA checklist first.
• Know which type of email it is. A service message about a customer's order or account is usually treated as a transactional email, not marketing, so keep it free of promotional content.

How quickly should you send an apology email for a delay?

Send an apology email for a delay as soon as you know the original date will be missed, before the customer has to ask. A proactive message about a late order usually needs no compensation; the same message sent after the customer complained needs more effort to repair trust. For outages, send a first notice once the problem is confirmed and follow-ups at the times you announced, even if there is nothing new to report.

Frequently asked questions

How do you write an apology email to a customer for a mistake?

Start with "We're sorry", name the mistake precisely, explain what you have already done to fix it, tell the customer what happens next and give them a direct way to reply. Keep it under 150 words where possible and use the customer's name and order details.

How do you say sorry to a customer for a delay professionally?

State the delay, apologize once and clearly, give the new date and offer an alternative (cancel or refund) if the new date does not suit the customer. Templates 1 and 2 above cover a delay in delivery and a delay in response.

Should you send an apology for an email sent by mistake?

Send a correction only if the mistake matters to the reader: a wrong price, a broken link to an offer, a wrong date or an email sent to the wrong people. A small typo does not need a second email. Keep the correction short and send it once.

Is it a good idea to offer a discount in an apology email?

A discount helps when the mistake cost the customer time or money, but it does not replace fixing the problem. Refund or replace first, then add a gesture if the situation calls for it, and never make it conditional on a review.

Who should sign an apology email to customers?

A real person whose name and role the customer can see: the support agent for a one-to-one issue, a manager for a bad experience, and a senior leader for outages or data incidents that affect many customers.