Although mail servers could be configured to silently discard email, the SMTP RFC strongly discourages this Except senders are known for being fraudulent or unwanted. For all other mail, the RFC recommends returning undeliverable mail with an mistake code. Sending unengaging or unsolicited material will increase the chance that https://it-support55555.blue-blogs.com/32983093/the-basic-principles-of-bulk-sms