In October, Google announced new guidelines that went unheard by many email marketers. They released a blog post as well. Yahoo also followed suit. There’s a lot of misguided commentary about the specifics of it, so today we’re going to break down some of the most important changes taking effect and why you should care. Main Takeaway: Google and Yahoo's recent guidelines largely reaffirm established best practices in email marketing. However, a key new detail is the public disclosure of a 0.3% spam complaint rate threshold. While exceeding this rate in a single instance won't immediately land you in the spam folder or get you blocked, it's a clear signal of stricter enforcement ahead. Maintaining a consistently low complaint rate is crucial, as repeatedly crossing the 0.3% mark will now lead to more severe consequences than before. NOTE: This episode is based on my personal knowledge, recent research as well as chatting with top 1% experts. However, I’m not a lawyer and nothing here should be construed as legal advice.New Email Sender GuidelinesAs of Feb 2024: Failing to follow these new guidelines will potentially result in Gmail limiting sending rates, blocking messages, or marking messages as spam. They haven’t made it clear what result is applied to what guidelines. Lots of folks are claiming that any of these will lead to you being blocked by Google, forever. While that’s possible, it’s not likely.Another misconception I’ve seen from plenty of folks is that this only applies to BULK senders, people with 5k daily email traffic. This is false. While Google wrote a spectacularly unclear and poorly structured document, it is pretty clear that most of the guidelines apply to ALL SENDERS. So if you misread and told yourself this isn’t a big deal because you don’t send 5k emails to Google users per day, you’re in for a world of pain.Here’s the TL;DR on the guidelines, they are essentially the same 6 for all senders and bulk senders, except bulk senders have a few extras.All senders 
Set up SPF and DKIM auth
Set up forward and reverse DNS records
Keep spam rates below 0.3%
Follow RFC 5322 for format
Don’t use a from @gmail.com account in your ESP
Add ARC headers, List-id: header
Bulk senders (5k or more emails per day)
Set up SPF and DKIM auth
Set up forward and reverse DNS records
Keep spam rates below 0.3%
Follow RFC 5322 for format
Don’t use a from @gmail.com account in your ESP
Add ARC headers, List-id: header
Set up DMARC
Support one-click unsubscribe, and include unsubscribe links
We’d need a whole series to cover all of these so we won’t go into each. You probably should’ve already been following the majority of these in the first place. We had a decent episode that covered authentication, SPF, DKIM and DMARC. RFC standards, ARC headers and one click unsub is generally adopted by most legit ESPs.I want to focus on 2 key changes that might be misconstrued or require a bit more digging and explanation:
Spam rates in PMT below 0.3%
Don’t impersonate gmail from headers
Keep spam rates reported in Postmaster Tools below 0.3%The biggest one and the one that’s most talked about is the 0.3% spam report threshold. Most senders don’t need to worry about this. If you have been following best practices for email like expressed opt-in consent and making it easy for people to unsubscribe, you don’t have major spam complaints. But not everyone falls in this bucket, and even if you do, you might not get off that easy going forward. This is especially freaking out people that do bulk outbound/cold marketing using email. If you’re not already set up using Google Postmaster to monitor your domain and IP reputation and related metrics, do it now.  This has actually been a common unwritten rule by mailbox providers (MBP) in the past, anything above 0.3% would potentially cause reputation issues. MBP also do plenty of sneaky things like counting the number of inactive accounts that got your email so you can’t dilute the ratio of complaints you