Hi @voffch,
I’ve moved your post to a new thread, to avoid sending too many notifications to the users involved in the 7-year-old one.
In recent years it seems that email delivery becomes less reliable if you change your emailing behaviour rapidly, e.g. suddenly sending many times more emails than usual. This can cause your domain to get limited or cause email to get flagged as spam more easily. Unfortunately this is exactly the behaviour that new issue announcements mimic.
There is a Mailgun plugin, not officially maintained by PKP, that might serve as a starting point.
Beyond that, OJS does not include rate limiting; if you’re seeing this kind of limiting imposed on your account, you might consider sending your announcements through an outside service.
Unfortunately all of this is quite dependent on the sending server and the receiving domain, so it’s hard to come up with general-purpose solutions. Email spam management is an arms race, and there’s only so much applications like OJS can do to get involved.
Regards,
Alec Smecher
Public Knowledge Project Team