Quick answer: To fax from email, sign up for an online fax service such as eFax or HelloFax, then send an email to [recipient’s fax number]@[provider’s sending domain] with your document attached. The service converts the email into a fax and transmits it to the recipient’s fax machine. No fax machine, phone line, or special hardware is required.
This works from Gmail, Outlook, Apple Mail, Yahoo Mail, and nearly any other email client. The process is essentially the same regardless of which email app you use.
How Email-to-Fax Actually Works
When you send an email to an address like [email protected], the email-to-fax provider receives the message on its servers, converts your attachment into a fax-compatible image format, and transmits it across a standard telephone or VoIP fax line.
The recipient’s fax machine treats the transmission exactly like a traditional fax. From their perspective, it arrives like any normal incoming fax.
This is why most fax problems are not caused by Gmail, Outlook, or your email provider. Issues are usually caused by:
- Incorrect fax number formatting
- Unsupported or poorly formatted attachments
- Busy or disconnected fax lines
- Sending from an unregistered email address
What You Need Before You Start
- An account with an online fax service
- The recipient’s full fax number including area code and country code if needed
- Your document saved as PDF, DOCX, TIFF, JPG, or another supported format
You do not need a fax machine or phone line to fax from email. You also do not need your own fax number unless you want to receive faxes by email.
Choosing an Email-to-Fax Service
The fax provider you choose determines your sending domain, monthly page limits, security options, and delivery reliability.
| Service | Sending domain | Free option | Best for |
|---|---|---|---|
| eFax | @efaxsend.com |
Free trial available | General personal and business use |
| HelloFax | @hellofax.com |
Limited free plan | Occasional users and Google integrations |
| MyFax | @myfax.com |
Free trial available | International faxing |
| RingCentral Fax | @rcfax.com |
Free trial available | Businesses and teams |
| FaxBurner | @faxburner.com |
Limited free plan | Light or temporary use |
After signing up, your provider will send you a welcome email containing your sending domain and assigned fax number. Save that email because you will use the sending domain every time you send a fax by email.
For a detailed breakdown of available providers, features, and reliability, see our online fax services comparison guide.
How to Send a Fax from Email
Step 1: Sign Up for an Online Fax Service
Create an account with a provider such as eFax, HelloFax, MyFax, or RingCentral. Once your account is active, the provider assigns you a sending domain like @efaxsend.com.
Step 2: Prepare Your Document
PDF is usually the best format because it preserves formatting and minimizes conversion issues. Most providers also support DOC, DOCX, TIFF, JPG, PNG, and TXT files.
If you are working from Microsoft Word, using Print > Save as PDF is often more reliable than exporting directly to PDF because it flattens the document and prevents rendering problems.
Try to keep attachments under 10 MB unless your provider specifically supports larger uploads.
Step 3: Compose Your Email
Open a new email in Gmail, Outlook, Apple Mail, Yahoo Mail, or another email client.
| Field | What to enter | Example |
|---|---|---|
| To | Fax number plus provider domain | [email protected] |
| Subject | Optional cover page title | Signed Contract |
| Body | Optional cover page message | Please review and sign. |
| Attachment | The document you want to fax | contract.pdf |
Important: Use digits only when entering the fax number. Do not use spaces, dashes, dots, or parentheses.
For U.S. numbers, include the country code 1. For example:
- Correct:
12125551234 - Incorrect:
(212) 555-1234
For international faxing, include the full country code without a plus sign.
Step 4: Send the Email
Click Send. The fax provider converts your attachment into a fax transmission and dials the recipient’s fax number automatically.
Most domestic faxes send within 1 to 3 minutes. International or multi-page faxes may take longer.
Step 5: Wait for Delivery Confirmation
Most providers send a confirmation email after delivery. The confirmation usually includes:
- The fax number dialed
- Delivery timestamp
- Page count
- Delivery status
If the fax fails, you should receive an error notification explaining whether the line was busy, disconnected, or incorrectly formatted.
How to Fax from Gmail
Gmail does not include a built-in fax feature, but it works seamlessly with online fax services.
- Open Gmail and click Compose.
- Enter the fax number followed by your provider’s sending domain in the To field.
- Add a subject line if you want a cover page title.
- Write a short message if you want cover page text.
- Attach your document using the paperclip icon.
- Click Send.
Your delivery confirmation should arrive in your Gmail inbox within several minutes.
See our full how to fax from Gmail guide for additional details.
How to Fax from Outlook
Outlook supports email-to-fax exactly the same way as Gmail.
- Open Outlook and create a new email.
- Enter the recipient’s fax number and your provider’s sending domain in the To field.
- Add optional cover page text in the subject and body.
- Attach your file.
- Click Send.
Some Microsoft 365 organizations also integrate enterprise faxing directly into their email environment. Check with your IT department if you use a corporate Outlook account.
For a complete walkthrough, see our how to fax from Outlook guide.
How to Fax from Apple Mail on iPhone or Mac
- Open the Mail app and tap or click Compose.
- Enter the recipient’s fax number and sending domain in the To field.
- Add optional subject and body text.
- Attach your document.
- Tap or click Send.
The process works the same way on iPhone, iPad, and Mac.
How to Fax from Yahoo Mail or Other Email Clients
Any email service that supports attachments can send a fax through an email-to-fax provider. Yahoo Mail, ProtonMail, Zoho Mail, Fastmail, and other providers all use the same address format:
[fax number]@[provider domain]
Can You Fax from Email for Free?
Yes, but free options usually come with page limits or temporary access.
HelloFax Free Plan
HelloFax offers a limited free tier that works well for occasional users who only need to send a few pages each month.
FaxBurner Free Plan
FaxBurner provides a temporary fax number and limited free sending or receiving for light use.
Free Trials
eFax, MyFax, and RingCentral typically offer free trials that allow full sending and receiving before billing begins.
For one-time faxing, a free plan or trial is usually enough. For regular medical, legal, or business use, a paid plan is far more reliable.
How to Receive Faxes by Email
When you create an account with an online fax service, you are usually assigned a dedicated fax number. Any fax sent to that number is automatically converted into a PDF attachment and delivered to your email inbox.
This allows you to receive faxes without a physical fax machine. Doctors, law offices, insurance companies, and government agencies can send documents directly to your online fax number.
Faxing Sensitive or Business Documents
Healthcare and HIPAA Compliance
If you send medical records or protected health information, use a provider that specifically offers HIPAA-compliant faxing and a Business Associate Agreement (BAA).
See our HIPAA-compliant faxing guide for more information.
Legal Documents
Many courts, law firms, and government agencies still accept faxed documents. Save your delivery confirmation email because it acts as proof of transmission.
International Faxing
Most major fax providers support international faxing. Always include the country code when entering the number, and check your provider’s international rate sheet before sending.
Troubleshooting Common Problems
No Confirmation Email
Check your spam folder first. If no confirmation appears, log into your fax provider dashboard and check your sent fax history.
Many providers only process faxes sent from the email address registered to your account.
Busy Signal or No Answer
The recipient’s fax line may be occupied or disconnected. Most providers automatically retry several times before failing the transmission.
Blank or Garbled Pages
This usually means the file did not render correctly. Print the document to PDF and resend it instead of using the original file.
Unsupported File Format
Convert the document to PDF and resend it. PDF is the most universally reliable format for fax conversion.
Large Attachments Not Sending
Compress large PDF files before sending. Most providers limit attachments to roughly 10 to 20 MB.
Frequently Asked Questions
Do I need my own fax number to send a fax from email?
No. You only need the recipient’s fax number. Your own fax number is only necessary if you want to receive incoming faxes.
Why does the email address use a fax number?
The digits before the @ symbol tell the fax provider which phone number to dial. The domain after the @ symbol routes the message to the correct fax service.
Can I send a fax from a work email account?
Usually yes, but many providers only allow sending from email addresses registered to the account.
Is email-to-fax secure?
Most reputable providers encrypt documents during transmission and storage. For sensitive records, choose a provider that explicitly supports secure or HIPAA-compliant faxing.
See our online fax security guide for more details.
What file formats are supported?
Most providers support PDF, DOC, DOCX, TIFF, JPG, PNG, TXT, and several Microsoft Office formats.
Can I fax multiple recipients at once?
Yes. Add multiple fax addresses in the To field, separated the same way you would separate multiple email recipients.
How long does faxing from email take?
Most domestic faxes are delivered within 1 to 5 minutes, although large or international transmissions may take longer.
Can I send a fax without a fax machine?
Yes. Online fax services let you send and receive faxes entirely through email or a web browser without any physical fax hardware.
Summary
Sending a fax from email is one of the easiest ways to fax without a fax machine. Once you have an online fax service, simply compose an email to [fax number]@[provider domain], attach your document, and click Send.
The process works from Gmail, Outlook, Apple Mail, Yahoo Mail, and nearly every other email platform. Using PDF attachments, properly formatting fax numbers, and sending from your registered email address will help ensure reliable delivery.
For occasional use, a free trial or limited free plan may be enough. For ongoing business, medical, legal, or international faxing, a paid service provides better reliability, security, page limits, and delivery tracking.