@Michel Bujardet
I send out probably 700k emails a month on my own self hosted email.
You have to make sure you have DKIM, SPF, DMARC setup and it is correct. Make sure your whois information for the domain is visible. Make sure your PTR is set correctly so reverse lookup shows the domain you are mailing from. You have to make sure you track clicks and opens, and bounces. Because you can not repeatedly send to emails that bounce. With hotmail, etc… you are even in trouble if an email inboxes and never get opened. So you have to get rid of the unopens and non clicks. But you need to track both, because open rate is not reliable at all… But, if you track by clicks, and they aren’t clicking links in your emails over the course of a month… they are more then likely dead as well, or not reading the emails at all.
When you start out sending you need to warm an IP address up. So you will never send over 500 per hour.
The problem you will find with Outlook, Hotmail, Live email addresses is that they will block a whole massive IP block… just because your host may have had some spammers on it. Then, if you get the block removed… they screw up a lot of times and block it again, just because it was blocked before. It is like they have an automated script that just resets all the dang blocks again every month.
My delivery rate is higher then it was with GetResponse, Aweber, Mandril, Sendgrid, Mailerlite, and a few others… The only thing that has given me an equal or better delivery rate was SES. But… SES and many others have a heart attack if you send out emails that they think are affiliate related. They also have a fit even if your own site has an affiliate program with some affiliate network that some other morons spammed links to. Yet the emails on my list are all legit emails that were from customers or opt-ins. I wa ssending out 37k emails on mandril, with a 98% delivery and a .0002% complaint rate. Still got canned from them. The complaints weren’t even friggin complaints most of the time. Most of the time it was their fault. They consider a delivered email a complaint if it ends up in the bulk folder of Yahoo, not even an actual complaint. So less then 10 complaints on each 37k send… they should have been happy as could be. Yet they still canned me.
Each email I send out goes out to about 6k to 37k people, depending on what I am sending out. My lists are heavily segmented.
Been sending email for a lot of years, because I have made a lot of software products that were strictly for marketing online, so I have seen just about everything they can throw at me. But the actual spammers make it hard for legitimate list owners at times.