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First of all, EHLO (and HELO) are nearly non-essential to proper SMTP operation of email delivery but more about a rudimentary authentication factor of “please
by egberts1 5y ago
First of all, EHLO (and HELO) are nearly non-essential to proper SMTP operation of email delivery but more about a rudimentary authentication factor of “please confirm who their mail server domain name is”.
If you trigger enough mismatched EHLO from their expected mailing domain name, into the spam dustbin, your IP address goes. And if their mail server is beefy, into the blackhole list (RBL/DNSBL) too!
- lechuhuuha 5y agoSo smtp check is the wrong way to verify an email address? Or the way im doing is wrong. Did i need to have SPF,DKIM config and send the real message to their SMTP server? My question is, is there any other way that this can be done? How do these services claim reliable validation in light of the above? I know that they are not going to reveal their methodologies, but can anyone on SO shed some more light?
- egberts1 5y agoLOL, there are open specifications online to everything SMTP-related. Start with the IETF RFCs.