There are 3 different email methods available within Mobile Estimator.
SMTP: Connect to your email provider to send off individual emails in Arborgold
Batch: Connect to your batch provider to send off multiple emails at once in Arborgold
Device: Connect to the default Mail app from your device
"Device" Email method setup tutorial
Whether you have an android device or an iOS device, Mobile Estimator can use the default email on your device. It will attach the proposal to an email and automatically insert the client's email in the "To" field.