How to Send a Fax Directly From Your Email Account

The Basic Process: Email to Fax Gateway

You can send a fax through email by using a fax-to-email gateway — a service that converts your email message and attachments into a fax and delivers it to a standard fax machine. The process is straightforward: you compose an email to a special fax number address (formatted like an email), attach your document, and the gateway handles the rest. The recipient receives it on their fax machine exactly as if you had sent it from a traditional fax device.

The main advantage is that you never need to own a fax machine, visit a fax service, or leave your desk. You use the email program you already have — Outlook, Gmail, Apple Mail, or any other — and the gateway does the conversion behind the scenes. Most services deliver the fax within minutes.

There are two ways to set this up: through a dedicated fax service (which you pay for monthly or per fax), or through your existing email provider if they offer the feature built in. The paid services tend to be more reliable for business use, while the free or included options work well for occasional faxing.

Key Takeaways

• You send an email to a fax number address (like 5551234567@faxservice.com) and the gateway converts it to a fax delivered to a real fax machine.
• Paid services like eFax, Fax.plus, and RingCentral offer dedicated fax numbers you can use to send and receive, with monthly plans starting around $10 to $20.
• Gmail, Outlook, and some other email providers include a fax feature built into their interface — check your settings or help menu to see if yours does.
• Attach your document as a PDF, Word file, or image; the gateway converts it automatically, so you do not need special software.
• Keep a record of the fax number you sent to and the time you sent it, in case you need proof of delivery later.

Using a Paid Fax Service

Paid fax services give you a dedicated fax number that works both ways — you can send and receive faxes through email. Services like eFax, Fax.plus, RingCentral, and MetroFax all work this way. You sign up, choose a fax number (often with your local area code), and then send faxes by emailing to that number or a special address the service provides.

To send a fax, you compose a new email in your regular email program. In the "To" field, you enter the recipient's fax number formatted as the service instructs — usually something like 5551234567@efax.com or similar. You can add a subject line and message text, then attach your document. The service converts everything to a fax and sends it to the fax machine number you specified.

Most paid services charge a monthly fee (typically $10 to $25) for a set number of faxes per month, with overage charges if you exceed that limit. Some offer pay-per-fax options if you only fax occasionally. The advantage is that these services are designed for regular business use, include features like fax scheduling and delivery confirmation, and provide a real fax number that others can use to send you faxes too.

Sending a Fax Through Gmail or Outlook

Gmail and Outlook both offer fax features built directly into their interfaces, though they work slightly differently. In Gmail, the fax feature is called "Google Fax" and appears as an option in the left sidebar under "Compose" — you click it to open a fax form instead of a regular email. You enter the recipient's fax number, add a cover page if you want, attach your document, and send. Google charges per fax (usually around $0.05 to $0.10 per page in the United States).

Outlook's fax feature works similarly but may be labeled differently depending on your version and region. Look in the "New" or "Compose" menu for a fax option, or search your help documentation for "send fax" to confirm whether your version includes it. If it does, you fill in the fax number and attach your document the same way you would in Gmail.

The advantage of using your email provider's built-in fax feature is that you do not need to sign up for a separate service or remember a special fax address format. The disadvantage is that you cannot receive faxes this way, and you pay per fax rather than a flat monthly fee, so it works best if you only fax occasionally.

Formatting the Fax Number Correctly

The way you format the fax number in the email address field depends on which service you use, so check the service's instructions before your first fax. Most paid fax services use a format like 5551234567@servicename.com, where 5551234567 is the recipient's fax number and servicename.com is the fax service's domain. Some services use a different format, such as fax5551234567@servicename.com or 1-555-123-4567@servicename.com.

If you use Gmail's built-in fax feature, you do not use an email address at all — you enter the fax number directly into a fax form, so formatting is not an issue. The same applies to Outlook if it has a dedicated fax interface.

Always double-check the fax number before you send. A single digit wrong means the fax goes to the wrong machine. If the service offers a delivery confirmation feature, use it for important documents — it will tell you whether the fax was received successfully.

What Documents Work Best

Most fax services accept PDFs, Word documents (.docx or .doc), images (JPG, PNG), and sometimes Excel files. PDF is the safest choice because it preserves formatting exactly as you created it, and fax machines handle PDFs reliably. If you have a paper document you need to fax, scan it to a PDF first using your phone's camera app (many phones have a built-in document scanner) or a physical scanner, then attach the PDF to your email.

Keep file sizes reasonable — most services accept files up to 10 to 25 MB, but a fax that is 50 pages long may take longer to process. If you are sending a very long document, consider breaking it into multiple faxes or checking with the recipient whether they prefer email instead.

Do not send executable files (.exe, .bat) or other potentially dangerous file types — fax services block these for security reasons. Stick to documents, images, and PDFs.

Delivery Time and Confirmation

Most fax services deliver within a few minutes of when you send the email. However, if you send during off-hours or to a fax machine that is offline, there may be a delay. Some services let you schedule a fax to send at a specific time, which is useful if you want to send something during business hours.

Always keep a copy of the email you sent and note the time and fax number. If the recipient says they did not receive it, you have proof of when you sent it. Many paid fax services provide a delivery receipt or confirmation page — check your account or email for this after you send. If a fax fails, the service usually sends you a notification explaining why (for example, the number was busy or the machine was offline).

If a fax fails and you need to resend it, try again after a few minutes. If it fails repeatedly, contact the recipient to confirm their fax number is correct and their machine is working.

Choosing Between Free, Built-In, and Paid Options

If you fax rarely — a few times a year — use your email provider's built-in fax feature (Gmail or Outlook) and pay per fax. The cost is low and you do not need another account. If you fax regularly for work and need a dedicated fax number that others can call, a paid service like eFax or Fax.plus makes sense; the monthly fee is worth it for the convenience and the ability to receive faxes too.

Some free fax services exist online, but they often have limitations: they may only let you send a few faxes per month, they may add watermarks to your faxes, or they may not work reliably. For important documents, a paid service or your email provider's feature is more dependable.

If you need to fax something right now and do not have a service set up, you can also visit a local UPS Store, FedEx Office, or library — they all offer fax services for a small per-page fee. This is slower than email-to-fax but works if you are in a pinch.

Frequently Asked Questions

Can I send a fax to an international number?

Yes, most fax services support international fax numbers. You format the number with the country code (for example, 44 for the United Kingdom) and the service routes it internationally. International faxes may cost more per page than domestic ones, so check your service's pricing before sending.

What if the fax machine is out of paper or offline?

The fax service will attempt to deliver for a set period (usually 24 to 48 hours), and if it cannot reach the machine, it will notify you that delivery failed. You can then try again later, or contact the recipient to confirm their fax machine is working and ready to receive.

Do I need to add a cover page?

No, a cover page is optional. Most services let you add one if you want, but you can send a fax with just your document attached. If you do add a cover page, include your name, phone number, and the date so the recipient knows who sent it.

Can I send a fax to multiple numbers at once?

It depends on the service. Some fax services let you enter multiple fax numbers in a single email, and they send to all of them. Others require you to send separate emails for each number. Check your service's documentation or try entering multiple numbers separated by commas in the "To" field.

Is email-to-fax find for sensitive documents?

Email itself is not encrypted by default, so if you are sending highly sensitive information, ask your fax service whether they offer encryption or find delivery. Some paid services do. For very sensitive documents, a phone call to confirm the fax number before sending is a good extra step.