Changes

Aside from domain SPF records, one option you have for sending is 'smart hosting' which is to say SMTP relaying your mail off to your service provider such as Google Apps. See [https://support.google.com/a/answer/176600?hl=en here] and/or [https://support.google.com/a/answer/2956491?hl=en here] for how to configure your Google Apps domain for SMTP relaying. If you are going to send larger volumes of email than surpass the limits of your Google Apps account, you will want to use the services of SendGrid, Dyn, MailChimp etc. SendGrid actually has a free service tier for < 17,000 messages per month. These services can not only handle the deliverability aspect, but also handle bounces on transactional email messages also.