Bonjour Philippe, You're going to have a bad time with residential IPs. Free/Illiad usually hands out fixed IPv4 addresses; if you aren't getting them from Free, I doubt your next ISP will be any better. See https://www.free.fr/assistance/54.html (zones dégroupées, etc.) .
I'm even surprised that Free allows you to use outbound tcp/25. For instance, my ISP (Orange) just sinkholes it. My current setup is to use a cheap dedicated server at OVH (Kimsufi) that has no such restrictions, and a fixed IP address. My entire mailing setup is there, but you could probably just use a dedicated machine or a VPS as a glorified proxy (see also Yuval's reply). >> Another thing you could try: your domain is currently registered with >> OVH. Some registrar offer basic email services, and even SMTP relay, >> with the registration. Have you checked OVH's offering? Or moving the >> domain to an alternative provider? https://gandi.net/ (c'est en >> France) ? >> >> Last but not least: a small cloud instance is less than 5EUR/month. >> Why don't you run your service there? get one at https://linode.com/ , >> https://vultr.com/ , or Digital Ocean? Last one I do not recommend. >> Bad experience. They do not police their users well enough and so >> their IP netblocks are associated with spammers. Association with >> spammer is what you are trying to avoid. >> Good luck, Moviuro
