Learn how emails are sent out when using the web app.
When you use the web app to email invoices to customers, the email will be sent "on behalf of" or "via" our servers. So, instead of the From address being from firstname.lastname@example.org, it would look something like:
From: Charlie Clark via mail132-18.atl131.mandrillapp.com
This happens, because when the customer's mail app receive the email, they check with example.com domain to see if that email was sent from them. Because example.com didn't send the email (our server did), it will indicate that the email is "on behalf of" or "via". In some cases, the mail app may even reject the email, thinking a spammer is spoofing your email address.
Changing the From address
If you want the emails sent via the app to not be sent "on behalf of" or "via" our servers, you need to add a SPF record to your domain name's DNS server.
Note: If you don't have your own domain — because you use a service like Yahoo! or Gmail — then you can't change the SPF record. The only way to have the email come from you is to save the PDF of the invoice and use your mail app to send it out.
If you don't know about domains and SPF records, the person who manages your domain name / website hosting may be able to assist you with this process.
To enable SPF, go into your domain's DNS or Advanced DNS settings. You should see a field that looks like this:
Enter the following information:
v=spf1 include:spf.mandrillapp.com ?all
NoteIf you already have an SPF record for this domain, include this in it instead:
Once you change your DNS records, make sure to wait at least 48 hours for the changes to propagate. Now emails sent via the web app should look no different than emails sent from your mail app.