None of my PHP apps (Wordpress, Moodle...) are sending emails

Hi Elena, I remember you from WF. Welcome to Opalstack!

Your account hit its 24-hour outgoing mail limit which is documented here: Outgoing Mail Volume

If you need a higher limit please contact our support!

If you hit the walls with Opalstack's email capabilities, check some services that focuses on delivering email. My favorite is https://www.mailjet.com/ (i don't have any involvement with them, except I'm their free tier customer).

It's hard for Opalstack to allow large volumes of emails sent because in case of spammer it can blacklist whole server which gives a whole lot of headache to Opalstack admins and customers. Also, using somebody that focuses on email deliverability usually gives you better deliverability. And if your emails have some purpose, getting better deliverability means usually getting more engagement, maybe money.

So i recommend you to consider some external service. You can use them as a SMTP so basically zero to none configuration to your scripts / apps / whatever.

Fjordis nice, but we're perfectly capable of handling large volumes of legitimate email and we go to great lengths to prevent spam from originating from our service.

We've had a few blacklist incidents in the past, but in almost every case it was the result of some stupid algorithm deciding that a new mail server sending a growing volume of mail equated to some kind of spam threat.

It's almost as though established mail providers have systems in place to prevent new mail providers from succeeding!

At any rate, our mail server reputation is clean and we're more than capable of handling any volume of legitimate mail. If you're having a delivery problem then please reach out to our support so that we can show you how to solve it.

Great to read these replies, since inbox deliverability was a concern in the past at WF. In the dashboard, all domains have a DKIM entry listed. @sean Could you ellaborate to how the DKIM entry for each domain will increase deliverability even through the shared smtp, and are there any additional recommendations in configuration, i.e. dns records/settings, i.e. SPF, DMARC to make the deliveries even more solid?