Did Google remove the precedence: bulk headers suggestion from their bulk sender guidelines?
Summary
What email marketers say4Marketer opinions
Email marketer from Email on Acid talks about keeping email lists clean to improve deliverability as well as not using the 'Precedence:bulk' header.
Email marketer from Mailgun support suggests to use other methods to improve deliverability as they do not recommend to use 'Precedence: bulk' anymore.
Email marketer from Reddit suggests that the header is largely outdated. Focus on DKIM, SPF, and DMARC for better deliverability.
Email marketer from Stack Overflow states that the 'Precedence: bulk' header is a non-standard header and its effectiveness varies across different email clients. They suggest that while it may have been useful in the past, modern email systems rely more on reputation and authentication.
What the experts say3Expert opinions
Expert from Email Geeks answers that it looks like Google has removed the precedence: bulk headers suggestion.
Expert from Email Geeks shares that the precedence: bulk recommendation is not in the latest bulk sender guidelines page but it is in older versions found on Archive.org, and provides links to the current and 2013 versions of the guidelines.
Expert from Word to the Wise answers that Google stopped suggesting precedence: bulk headers in their documentation a long time ago.
What the documentation says3Technical articles
Documentation from RFC Editor details the precedence field, though not specific to bulk. It describes how precedence hints at the importance of a mail message.
Documentation from Internet Archive shows a snapshot from 2013 where Google recommended using the 'Precedence: bulk' header for bulk mail to help Gmail filter the emails correctly.
Documentation from Google Support confirms that the 'Precedence: bulk' header is no longer recommended in their current bulk sender guidelines. They advise using other methods for managing bulk email.