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'''. Note too that you should set the 'Comprehensive mail storage setting' <ref>https://support.google.com/a/answer/3547347</ref> when using systems (like issue trackers) that deliver mail on behalf of users, via the SMTP relay and you wish copies of those messages to be stored in GMail. If you are going to send larger volumes of email than that surpass the limits of your Google Apps account, you will want to use the services of SendGrid, Dyn, MailChimp (Mandrill<ref>They [http://thenextweb.com/dd/2016/02/25/in-hostile-move-mandrill-gives-all-developers-60-days-to-switch-to-paid-mailchimp-service/ cut off their free developer accounts] giving users 60 days to test and implement a new solution or pay for a MailChimp account</ref>) 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 too.