Bulk email software is software that is used to send emails in large quantities. It is generally used for legitimate mailings, such as for email list subscribers. Since the bulk email software usually sends an email via direct send and via SMTP server, the use of a bulk email software for spam is almost impossible, because of the large number of emails that are sent in a spam campaign. Bulk email software usually refers to standalone software, while there is a bulk email sending web-based services as well.
Junk email messages are “spam” messages, which are unsolicited (and typically unwanted) email messages that are filtered by the service. By default, the service rejects the spam message based on the reputation of the sending IP address. However, if it passes IP inspection but is classified as spam by the content filters, the message is sent to the Junk Email folder of the intended recipients.
Bulk email also referred to as graymail, is a type of email message that’s more difficult to classify. Whereas junk email is a constant threat, bulk email is typically comprised of an advertisement or marketing message that’s not likely to get sent repeatedly. Bulk email is wanted by some users, and in fact, they may have deliberately signed up to receive these messages, while other users may consider these types of messages to be spam. For example, some users want to receive advertising emails from the Contoso Corporation or invitations to an upcoming conference on cybersecurity, while other users consider such emails to be spam.
How to manage bulk email isn’t a clear cut decision, because if all bulk email is classified as spam, the users that want it may complain and submit it as a false positive (non-spam) message that was wrongly marked as spam. On the other hand, if all bulk email is let through, the users that don’t want it may complain and submit it as a missed spam message (false negative) that wrongly arrived in their inbox.
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