That's recipient testing based on mailbox name. I don't recommend that for spammers - its so trite and early 2000s.
I wont allow you to test deliverability to my email domains without you sending an email I can analyze and decide to allow or drop mid stream. I also get to drop it before you consider it sent. I obviously drop connections that just establish from and to and go weird after that.
Comments
That's recipient testing based on mailbox name. I don't recommend that for spammers - its so trite and early 2000s.
I wont allow you to test deliverability to my email domains without you sending an email I can analyze and decide to allow or drop mid stream. I also get to drop it before you consider it sent. I obviously drop connections that just establish from and to and go weird after that.