Despite the fact that mail servers is usually configured to silently discard email, the SMTP RFC strongly discourages this Except senders are regarded for being fraudulent or unwanted. For all other mail, the RFC endorses returning undeliverable mail with the error code. Sending unengaging or unsolicited content will increase https://it-support30677.ageeksblog.com/26358959/the-basic-principles-of-bulk-sms