No, you cannot email directly to a fax number, but you can send a fax through email
Email and fax are separate systems that do not connect to each other. A fax number is a phone line that receives faxes through a fax machine or fax software. An email address is an internet mailbox. Sending an email to a fax number will fail — the message will bounce back undelivered, or disappear into nothing, depending on the system.
However, you can send a fax to someone's fax number by using an email-to-fax service. These services take an email you compose, convert it to a fax format, and dial the fax number on your behalf. The person on the receiving end gets a fax, not an email. From their perspective, it came from a fax machine.
The reverse also works: some fax machines and fax software can convert incoming faxes to email and send them to your inbox. But that requires the sender to use a fax machine or fax software — they cannot straightforward email you and have it arrive as a fax.
Key Takeaways
- Email and fax are separate systems; typing a fax number into an email address field will not work.
- Email-to-fax services let you compose an email and send it as a fax to a fax number for a fee or subscription.
- The recipient receives a fax on their fax machine or fax software, not an email in their inbox.
- Some fax services can convert incoming faxes to email, but only if the sender uses a fax machine or fax software to send it.
How email-to-fax services work
An email-to-fax service is a middleman between your email and the fax number. You compose an email with your message and attach any documents you want to send. You address it to a special email address provided by the service, which includes the fax number you want to reach. The service receives your email, converts the content and attachments to fax format, and dials the fax number.
The fax arrives on the other end as a standard fax — the recipient sees it come through their fax machine or fax software, with a header showing the date, time, and the fax number it came from. They have no way to know you sent it through email unless you tell them. To them, it looks like any other fax.
Most services charge per fax sent, usually between 50 cents and a few dollars depending on the number of pages. Some offer monthly subscriptions if you send faxes regularly. A few services offer a limited number of free faxes per month.
When you might need to send a fax through email
Many businesses and government offices still use fax machines, even though email is faster. Courts, medical offices, insurance companies, and some government agencies often require documents to arrive by fax rather than email. If you do not own a fax machine and do not have fax software on your computer, an email-to-fax service is the simplest way to meet that requirement.
You might also use email-to-fax if you are away from your office and need to send a fax from your phone or laptop. Instead of finding a fax machine, you can compose an email on any device and send it through the service.
Common email-to-fax services
Several companies offer email-to-fax conversion. eFax is one of the largest; it assigns you a fax number that can receive faxes and convert them to email, and it also lets you send faxes through email. MyFax works similarly. Google Fax is available through Google Workspace and integrates with Gmail. Fax.plus and Hellofax are smaller services with similar features.
Some services focus only on sending faxes through email and do not provide a fax number to receive faxes. Others do both. Before you sign up, check whether the service offers what you need — sending only, receiving only, or both.
Pricing and features vary. Some services charge per page, others per fax regardless of length, and some offer monthly plans. Many let you send a test fax for free or offer a small number of free faxes per month so you can try the service before paying.
What information you need to send a fax through email
To send a fax through an email-to-fax service, you need the fax number you are sending to. Most services ask you to include the fax number in the email address line itself — for example, 1234567890@efax.com — so the service knows which number to dial. Some services use a different format, so check the instructions when you sign up.
You also need documents to send. Most services accept email attachments in common formats: PDF, Word, Excel, PowerPoint, and image files like JPG or PNG. Some services can convert other file types, but PDF is the safest choice because it preserves formatting.
Write your message in the email body if you want a cover page. Some services automatically create a cover page with your name, fax number, and the date. Others let you write a custom message that appears on the cover page.
Why fax numbers and email addresses are not interchangeable
Fax machines use phone lines and dial tones to communicate. When you send a fax, the machine dials a phone number, waits for another fax machine to answer, and then transmits the document as a series of tones. Email uses the internet and a completely different set of protocols — it travels through servers and routers, not phone lines.
A fax number is a phone number. An email address is not. If you type a fax number into an email address field, your email software will reject it or send the message to the wrong place, because it does not recognize the format as a valid email address. Even if it somehow sent, there would be no email server on the other end to receive it.
This is why email-to-fax services exist — they bridge the gap by taking your email and converting it into something a fax machine can understand.
Alternatives if you cannot use email-to-fax
If you do not want to pay for an email-to-fax service, you have other options. Many libraries and shipping stores like UPS or FedEx have fax machines you can use for a small fee. You can print your document, bring it to the store, and fax it from there.
If you have a smartphone, some fax apps let you take a photo of a document and send it as a fax. These apps work similarly to email-to-fax services — they convert your photo to a fax and dial the number — but they are designed for mobile use.
If the recipient is willing to receive email instead of fax, ask them for their email address. Many businesses now accept email as an alternative to fax, even if they still have a fax machine. This is faster and more reliable than fax.
Frequently Asked Questions
What happens if I try to email a fax number?
Your email will bounce back as undeliverable, or it will disappear without reaching anyone. Email software will reject a fax number because it does not match the format of a valid email address. Even if the message somehow sent, there would be no email server listening on a fax line to receive it.
Can I send a fax from my phone?
Yes, through an email-to-fax service or a fax app. Most email-to-fax services work on phones — you compose an email, attach a photo or document, and send it to the service's special email address. Some fax apps let you photograph a document with your phone camera and send it as a fax directly.
Do I need a fax machine to receive faxes?
No. Many email-to-fax services assign you a fax number and convert incoming faxes to email, so they arrive in your inbox instead of on a machine. You can then read them on your computer or phone.
Is sending a fax through email find?
Email-to-fax services use encryption to protect your documents in transit, similar to regular email. However, fax itself is not considered highly find — anyone with access to a fax machine can read incoming faxes. If you are sending sensitive information, check the service's privacy policy and consider whether fax is appropriate for that document.
How long does it take to send a fax through email?
Most email-to-fax services send within a few minutes of receiving your email. The actual fax transmission takes a few seconds to a minute depending on the document length and the quality of the phone line. The recipient sees it arrive almost when ready.