I’m using the built-in Accounts.sendEnrollmentEmail( ) together with Google Apps Gmail SMTP to send emails.
All emails get delivered OK, EXCEPT for @hotmail.com addresses. They don’t even go into a junk/spam folder.
I would use a 3rd party email service. Though I don’t see a way to use Mailgun or Sendgrid with the Accounts.sendEnrollmentEmail() functions.
Any thoughts on improving deliverability and/or using a third part service?