You can simply send an email to [destination fax number]@fax.smtpengine.io with a PDF of the fax you wish to send. For example - if you want to send a fax to 3609865200, you would email a PDF to 3609865200@fax.smtpengine.io  The email platform that you may be using may warn you that you are trying to send an email without a subject or text in the body. That is fine you can still send your fax without any issues.

Note: Your email and attachment sent to [destination fax number]@fax.smtpengine.io must be less than 5MB in total size. If this size limit is exceeded, your request will fail to process without an error.

Tip: If you have whitelisted an email address on more than one phone number, you may specify the desired source phone number by typing it into the subject line of the Email that is sent for your fax.