I am working for a site currently having MailPoet to send all the newsletters. We have around 800 subscribers and everything is configured properly and working fine.
Now, we got around 5000 emails for a new mailing list required only for a specific event that we are hosting. Mails need to be sent to these lists just once or twice. We do not want to upgrade Mail Poet for more subscribers. Instead, I found a new newsletter SendinBlue where I can send unlimited subscribers mails.
I do not wish to disturb the current newsletters through MailPoet but install SendinBlue side by side and send the new newsletters for one time use. Is it safe to activate SendinBlue along with Mail Poet and not hamper the mail plugin?
If not, how do I ensure to not mess up? Is there any other way to achieve the same?