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Email to/from SMS

Documentation of how to send emails to SMS and using web hooks to receive messages and have them delivered to your email inbox.

Email to SMS

To use this API, you need to whitelist one or more emails or an entire domain, for sending SMSes.

Whitelisting emails

To whitelist emails and domains go to “Settings” “Email Whitelist”, add an email like or an entire domain e.g. if your whole organisation should be able to send messages this way.

If you whitelist no other accounts will be able to use this domain. Because of this we require addresses from webmail providers to not only be the domain, such as,, etc.


To successfully deliver your email as a SMS you have two options for proper authentication:

  • Your whitelisted emails or domain, need to pass SPF check and have a DKIM record.
  • You need to put an API token in the Subject field of the e-mail.

For security reasons we highly recommend option 1, since e-mails in most cases are transferred unencrypted over SMTP, an attacker might be able to capture your API tokens. We do provide the second option for customers that are unable to setup SPF and DKIM for their e-mail.

If you use API token and you also use our IP whitelist, then you will need to whitelist the IP-address of your outgoing e-mail server as well.

Sending an SMS

Sending via the Email to SMS api is straightforward, all you need to do is send to the phonenumbers of your recipients and set a default sender id.


Sending SMS messages is a simple as sending an email to the, for example

Sender ID

Your sender ID is controlled by the default sender setting found under “Settings”, “SMS defaults”.

SMS length

SMSes send on this API is limited to 20 SMS parts, equal to 3060 characters, this is a measure to try and prevent unintenionally long SMSes send, when using email clients like e.g. Gmail, where the mails are kept as conversation threads, where responding to the original email, will keep the entrie conversation in the email.

SMS to Email

Receiving SMS messages from your users in your email inbox, requires you to have a virtual number attached to your account, and to use this number with a SMS to Email web hook.

SMS to Email Webhook

Navigate to “Settings” “Web hooks” and setup a web hook, of the type, SMS to Email Give your web hook a name, and add email adresses that should receive the SMSes.

SMSes will be delivered with from address: for example.