In our to improve deliverability we are now going a little bit slower when sending broadcast emails to lots of recipients. If you're sending to less than 20,000 people at a time this won't effect you. If you're sending more than that then for domains new to Buzzshot (or which haven't sent a lot over the past 6 months) will send at a rate of 20,000/hour for the first day as a warm up period. After the warm up period we'll send in batches of 50,000 at a time with a gap of 30 minutes between each send.
This gives the email servers (such as Gmail and Outlook) time to recognise your incoming emails as not spam and should reduce the rate of emails ending up in spam folders. Please allow extra time for delivery when sending large broadcasts in the future.
If you think this might cause an issue for you then please do get in touch and we'll see what we can do to mitigate that. Please also get in touch if you have any questions.