3 ms·
If you send from non-SPF listed IPs you will get rejected in many places and most likely marked as spam in those you don't. SPF particularly and DKIM and other
by eikenberry 10y ago
If you send from non-SPF listed IPs you will get rejected in many places and most likely marked as spam in those you don't. SPF particularly and DKIM and other anti-spam measure are in wide spread use and enforced by the receiving SMTP server either directly or via spam scoring system rules.