Just thought I would update this topic for anyone who has a similar question or issue.
We are using G-suite from Google. We moved to Google from GoDaddy because we were limited to the number of relays per day. Our company is growing, and it was too expensive to add relays from GoDaddy.
Originally we were sending one email per session, but Google limited the number of sessions, and would block any additional sessions.
We started using the bulk email with tokens code within DNN (We are using 9.8.1) and still had a similar issue. It turns out Google sets a limit of 100 SMTP email address sends per session. We have a TO and a CC, so that was counting as 2 sends. The session would close as soon as we got close to the 100 (It was never an exact number).
We are looking into a provider where we can send our emails via the DNN SMTP client. (In addition to the normal DNN email, the administrators of each portal send a weekly news letter, emails blasts to either the whole directory or a portion.
Just to throw it out there, What are people using to send out emails to their customers? Has anyone else had to use an SMTP email provider because their site is sending too many emails?
Just for full discolsure: THIS IS NOT SPAM EMAIL. These are customers who expect to recieve these emails.