Outgoing email server for Wordpress Newsletter
I am considering migrating a client's Wordpress installation from a shared hosting setup to a Digital Ocean Ubuntu/LAMP/Wordpress droplet. However I am concerned about the setup needed for handling email.
Apart from a couple of email addresses on the domain, which could be handled by a separate email provider like Zoho, Gmail/Google Apps, or Microsoft Outlook 365, the client also uses a Wordpress Newsletter plugin, which manages the subscriber list and also auto-populates the newsletter with the latest posts (due to this feature it needs to be integrated into wordpress).
From the information here it is not recommended to run your own full email server on a DO droplet.
On the other hand I could go for a send-only server, like Exim, as described here however I am worried about DO's IP addresses being flagged as spam originators. It seems to be an issue users encounter.
What is the best solution to support this without running risks of over maintenance of mailserver components and also not having such emails flagged as spam?