Most people should probably just use a third-party email service provider so they don't have to worry about issues like this. Deliverability is a pain to manage if you don't have to.
I didn't know about the existence of Google Postmaster Tools[0] so that was a cool discovery :)
Most cloud providers (e.g. Google [1] and Amazon) as well as ISPs block outgoing traffic on TCP port 25 (SMTP) so it's actually fairly hard to run your own SMTP server to begin with.
8 comments
[ 2.8 ms ] story [ 25.5 ms ] threadI didn't know about the existence of Google Postmaster Tools[0] so that was a cool discovery :)
[0] https://postmaster.google.com/
[1]: https://cloud.google.com/compute/docs/tutorials/sending-mail...