HI @maddiebarbera, first, welcome to the community!

So, a few things you might want to check to troubleshoot - it does seem strange that it’s isolated to a particular inbox provider (Apple), and across all three different accounts, but this might give you some clues on what’s going on.

Check your Deliverability Bounce Detail Reporting

You can look at the accounts’ overall deliverability in the Sidebar → Analytics → Deliverability, then go to “Bounce details” in the secondary sidebar.  In the “Bounce report” section, select Apple as your “Inbox Providers” and see what type of bounce reasons that Klaviyo is finding.   

It might look something like this:

If you don’t see any reports, make sure you have a wide enough time period

In my example, there’s not enough incidents to find a conclusive reasons for those bounces, but yours may differ and you may be able to address them.

Other suggestions to consider:

• Are all your brands on a branded sending domain yet?
• Or, did you recently switch to one to be compliant with Google/Yahoo Bulk Sending?  Perhaps you’re getting caught into something algorithmic in a sudden change, and with high volume or frequency shortly after a change.
• Is all the configurations (e.g. SPF/DKIM/DMARC) correct?  Some inbox provider may be more sensitive to updates or misconfigured settings.  I realize it’s unlikely all three accounts have these issues, but just verify.
• Apple doesn’t have a feedback loop for Postmasters for the general public, but they do have some specific guidlines here.  You may want to take a look here: Postmaster information for iCloud Mail

Hope this helps!  Perhaps others can chime in with other suggestions or ideas.

Hi @retention - thanks for your response. Answers below:

• Yes, all three accounts are on branded domains. 
• I made changes to be compliant with Google & Yahoo’s send requirements several days after this issue started, so I don’t think they’re related. 
• I have checked, double checked, and triple checked the SPF/DKIM/DMARC configurations and everything seems to be set up properly.
• I reached out to Apple and have tried to check the things they suggest. 

I really don’t understand how it happened across three separate accounts all at once. My emails to these addresses are bouncing when sent from Shopify as well. I am at a loss...any extra info or suggestions of what to try next are much appreciated!

I have exactly the same issue. Sadly had to remove all Apple email addresses as my bounce rate was high. 

Following up on this. We have had the exact same thing starting last tuesday with our bounce rate reaching 5% all due to Apple related emails. All with the same 554 5.7.1 cs01] message rejected due to local policy Which also provides zero insight into what is happening.

I have gone through much like OP here and have checked everything on our end there is nothing that should be causing this and all of the sudden as well. 

We set up branded domain in Klaviyo back in December and had zero issues until March 19th. All domain policies have been set and set correctly, Our Google Postmaster indicates no issues with reputation. MX Tools shows everything is good and not even blacklisted. 

Why would this start all of the sudden and seemingly at random. If it were one person I would say its isolated to their list, but clearly more and more people are being affected by this and can cause harm to our sending rep.

Need real answers. 

@KennSampson I checked internally with a deliverability expert and it’s definitely unusual for a bounce rate to be that high and also issuing from Apple. There isn’t a known issue going on with Apple domains. Bounces can happen for any number of reasons and variables that are unique to each domain and campaign. So, in order to properly diagnose this I suggest reaching out to our Support team. They’ll be able to dig into your account and campaigns and figure out what might be affecting your bounce rates and solutions to fix it!

@maddiebarbera @Anna at Mixed Media Classes @KennSampson 

Were any of you able to get a resolution to this issue? I have a client that has the same issue since Feb of this year. It is definitely an Apple issue because all emails from this company whether from Klaviyo or their regular business emails are blocked to all Apple email addresses. I’ve sent multiple emails to icloudadmin@apple.com and received one response saying they made changes and to try again, which did not work, and no response from them since, despite repeated replies with the reference Case-ID they assigned. 

Same issue here @tonyc - All apple emails, A soft bounce due to Content - no infractions with other mailboxes and customers had been actively engaging with and purchasing from emails even the day before. 

Hoping some one from @Klaviyocommunity can share some insight here?

Just to let you know that I emailed icloudadmin@apple.com on the suggestions of another member of the Klaviyo community ( @Lidgeriz  )

 and apple support came back within 24 hours saying that the issue had been resolved

Just resent to a small number of bounced apple subscribers and so far it all seems OK 

Hi ​@Lookout its Gemma - really hoping that you may be able to help! We tried reaching out to them and after the 6th email we are still being ghosted by Apple. Was the email that they responded with to you with the resolution, was that icloudadmin@apple.com or was it another email? And did you have a case or reference number? 

If emails to domains like atme.com, aticloud.com, and atmac.com are bouncing:

1. Check Bounce Reason: Review the bounce error messages in Klaviyo to understand the cause (e.g., invalid domain, server issue, etc.).

2. Validate Email Addresses: Ensure the email addresses you're sending to are correct and valid.

3. Contact Domain Administrator: If the issue is specific to those domains, reach out to their admin to confirm there are no blocks or issues with their servers.

4. Warm Up Sending IP: If you're using a new sending domain or IP, warm it up gradually to build reputation.

5. Klaviyo Support: Contact Klaviyo support for help troubleshooting deliverability issues specific to these domains.

6. Use Dedicated Sending Domain: If not already in place, set up a dedicated sending domain to improve trust with recipients’ email servers.

There is a Shopify Bot that is attacking via webhook -- adding thousands of profiles every day to some Klaviyo accounts.

Make this segment…
1.DO NOT SEND_1.klaviyo bots_not suppressed

This segment will look for checkout started events that have ZERO events at Shopify. These are bots.
Note, the “accepts marketing” is a Shopify event, vs “If some can or cannot receive marketing” is a Klaviyo suppression.

This segment will tell you if you have an infestation from the well known Shopify webhook bot.

ADDITIONALLY, you can also try to identify bots that touch Shopify… using this segment:

2. DO NOT SEND_Subscribed to Email Marketing via Shopify Customer Webhook

BUT -- this segment can also trap visitors who go directly to a product, ATC, then checkout started, and add an email, before any other indentity graph tracking. So be careful with this one…

IF you have hundreds or thousands of profiles in these segments, you may be a victim of the Shopify bot attack. Please message me privately and I will share your details with Shopify and let you know who to reach out to at Klaviyo.

​@AliciaM  - try sending your emails to icloudadmin@apple.com from an icloud email like the one for your Apple account. They finally responded and resolved my blocking issue, but only after I started emailing them from an icloud.com email address. If you are forwarding an email with the blocked message, they will block it regardless of which email domain you send from, so just take a screenshot of the message or copy just the message and paste into a new email, preferably from an icloud account.

Hi Jeremyroberts,

Here’s how to address the issue:

1. Segment 1:

   • Create a segment named DO NOT SEND_1.klaviyo bots_not suppressed.
   • Set conditions to filter profiles with “Checkout Started” events but zero Shopify events. These profiles are likely bots.

2. Segment 2:

   • Create DO NOT SEND_Subscribed to Email Marketing via Shopify Customer Webhook.
   • Use this cautiously, as it may include legitimate users who interact directly with products before identity tracking.

If these segments reveal hundreds or thousands of profiles, it confirms bot activity. Let me know, and I’ll guide you on reporting this to Shopify and Klaviyo contacts for further resolution.

Please let me know if you need help setting up these segments.

Thank you so much ​@tonyc - great advice!

> Let me know, and I’ll guide you on reporting this to Shopify and Klaviyo contacts for further resolution.

​@MANSIR2094 already reported to Klaviyo Engineering
And they are in contact with Shopify.
This bot can DESTROY a sender’s reputation and kick your deliverability into the toilet.
I was fortunate to reach someone in Klaviyo engineering support.
They helped me build a “bot killer” flow.
But this is real. And it’s happening to many accounts.

I understand the severity of this issue and the potential impact on sender reputation and deliverability. Since Klaviyo Engineering is already aware and collaborating with Shopify, that’s a great step forward.

Here’s how we can proceed:

1. Bot Killer Flow: If you can share details of the “bot killer” flow provided by Klaviyo support, I can help implement it in your account to mitigate this threat.

2. Ongoing Monitoring: I recommend closely monitoring the DO NOT SEND segments and setting up alerts for any unusual activity.

3. Further Action: If additional action is required, let me know, and I’ll work to ensure we stay ahead of this issue.

MANSIR2094 thanks so much for your help! 

Are you able to send screenshots of the set up of these segments? Wasn’t 100% certain on the way to set them up. 

Thanks!