Whilst mail servers might be configured to silently discard email, the SMTP RFC strongly discourages this Unless of course senders are acknowledged being fraudulent or undesirable. For all other mail, the RFC recommends returning undeliverable mail with an error code. This can be a bulk email, but not a https://donovanwqdqb.blognody.com/26406174/the-5-second-trick-for-bulk-sms