jebblue wrote:
Otherwise, giving control of your email to another company is maybe not the best idea in many situations.
That depends on who the company is. Some people don't trust Google or Microsoft. But there are other options too, like Fastmail and Tuffmail, if you're willing to pay. There's probably an option for anyone except the most paranoid people.
xer0 wrote:
I need to verify whether automated response emails will work for new users. Can anyone confirm OR do I still need to use a 3rd party like Amazon or Postmark app?
Amazon SES is really easy, because they support plain old SMTP. You just need to make sure that Amazon is in your SPF record and your web app is able to make use of an external SMTP server. If you're writing your own app, most e-mail sending libraries such as PHPMailer and SwiftMailer support external SMTP servers.
You can also set up send-only Postfix. It is extremely rare for e-mails sent from a properly configured send-only Postfix instance to be rejected by major e-mail services. In this case, you will be responsible for using a fully qualified domain name as your mail server hostname, ensuring that this fqdn has a DNS entry that actually points to your Linode, etc. But once you've set it up, it's mostly maintenance-free.