I have the same issue and I can’t find on any of @fritex an answer. My emails are being flagged as spam on some servers. I use Google to send emails with my domain. I have SPF and DKIM.
Any ideas?
Some suggestions here, How to prevent your emails from going to spam
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Have you checked this topic here?:
Kindly, may I ask what is your domain name so I could re-check what do you have here for a case and provide a solution to your issue?
Does mail records exist and if so, are they being 
or 
cloud at DNS tab on Cloudflare dashboard?
Regarding your domain and sending via Google, do you have your domain added to Google Suite/Workspace or just using your Gmail account?
May I ask are you actually using Google mail server for POP/IMAP and SMTP in your e-mail client like MS Outlook, Mozilla Thunderbird, etc., or using like mail.yourdomain.com to receive/send emails?
Well, e-mail providers which use uceprotect.net as a RBL mail filter, it’s normally to be on their SPAM list as it lists even a users with Gmail as a SPAM.
https://support.cloudflare.com/hc/en-us/articles/200168876-Email-undeliverable-when-using-Cloudflare
Hey!
I have Google Workspaces setup as the article you shared, I have never issues with email delivery in 5 years using the Google and Cloudflare. When one of the domains I use on Cloudflare was listed on Spamhaus SBL https://check.spamhaus.org/listed/?searchterm=172.67.152.225 my emails started to being marked as SPAM on some servers. The logs on some of those servers was:
5.0 URIBL_SBL_A Contains URL's A record listed in the Spamhaus SBL blocklist [URIs: charrua.es]
Kindly, may I ask what is your domain name so I could re-check what do you have here for a case and provide a solution to your issue?
My domain is charrua.es
Does
Regarding your domain and sending via Google, do you have your domain added to Google Suite/Workspace or just using your Gmail account?
I have my domain added and verified on Google Workspaces
May I ask are you actually using Google mail server for POP/IMAP and SMTP in your e-mail client like MS Outlook, Mozilla Thunderbird, etc., or using like
mail.yourdomain.comto receive/send emails?
I send mail from an apple email client using IMAP and SMTP
I just wonder, how does it come, if you are sending via Google mail servers, your emails get marked as SPAM?
I mean, if they have so big infrastructure, resources and people, why they cannot handle simple e-mail server configuration? 
The above screenshot could be one reason why.
As for example of above, if the recipient’s e-mail servers are rejecting receiving of e-mails from the IP address which does not have a configured PTR record (hostname for that IP), unfortunately, you cannot help yourself here - which is in Google’s hands.
Therefore, if you are using your domain hostname charrua.es as a POP3/IMAP/SMTP instead of Google servers, which is being proxied via Cloudflare (
cloud), then I am not surprised why it happens as Cloudflare doesn’t proxy e-mail traffic (stated in a few articles).
Furthermore, if you are sending e-mails via your domain, for example, some contact form on the Website, etc., it could be also reason why your e-mails go to SPAM folder too as the sending client / app is not configured to use Google servers, instead are using web hosting server (for example IP is not being listed as allowed sender in SPF record, etc.).
Regarding getting listed on SBL/RBL’s lists, from time to time I also get a notification, but just ignore it as the IP of Cloudflare is only being used for a Web traffic and not for my e-mails.
Even my e-mail server IP address get “listed”, due to my provider’s IP address range or AS number is on the list, while my directly IP address is not.
While being listed only on one lists is actually not that big issue at all.
Nevertheless, there is a post already suggesting what to do and how to prevent your emails going to SPAM.
Maybe you are getting this notification as you are tracking your main domain, instead of Google server’s domain (ASPX something), while not using your main domain to send/receive e-mails as you obviously do not.
- watch out if you get surprised if Google’s addresses are on more than one blacklists while you track their …
Hey, thank you for your information.
On the hosting companies that blocked my email and flagged as SPAM, they have told me that could be the email signature, I use my domain there with a link to my website.
All emails I sent, event the ones from the website contact form are using Google’s SMTP server.
I don’t think this has nothing to do with Google and I understand that CloudFlares IP are not being used for sending emails, but It’s not logical that the IP is listed under a SPAM blacklist.
Looking further on the Spamhaus SBL, is CloudFlare who can request for being removed from the list.
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Hi @danielp1,
In general, providers should not use shared web IPs to determine whether an email is spam. If a Cloudflare IP is added to a blocklist by a provider and you think this is negatively affecting your site or email reputation, you will need to contact support. The community cannot assist you with this.
To contact Cloudflare Customer Support, login & go to https://dash.cloudflare.com/?account=support and select get more help. If you cannot login, email [email protected] from the email address on your account. If you receive an automatic response that does not help resolve your issue, reply and indicate that you still require assistance. And, please share your ticket number here so that we can track it.
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Created a ticket ID #2214144
As I’m on a free plan, the ticket gets auto-solved: 
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I believe you overlooked this suggestion:
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Yes, make sure you reply back to that, @danielp1. Feel free to include a link to my reply so support can see we sent you back there. I’ll also escalate this topic and your ticket to Customer Support here.
@sdayman you are right, I missed that part. Thank you for sharing.
@domjh done, reply sent.
Thank you both!
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