On 2024-06-08 14:56, Ansar Mohammed via talk wrote:
> do they still block inbound/outbound SMTP?
I cannot verify this, but it's to be expected that residential
connections would block this feature.
Otherwise, the ISP risks getting their IP range blocked by spam block
lists should one customer become hacked, or otherwise misbehave.
Large mail providers such as Gmail,
outlook.com and
yahoo.com already know if an email comes from a DHCP pool and if so they deliver such mail pieces straight to the recipient's spam folder.
If your public IP address is in a DHCP pool, try checking its reputation and you will see why it is not a good idea to host an email server on an IP address from a DHCP pool: