Email Deliverability Issues to Yahoo and Outlook

aaP_haythemspintechs

I have set up a VPS server on Contabo and installed aaPanel to host my website and manage my email server. The mail server is configured with Cloudflare, and I’ve ensured that SPF, DKIM, and DMARC records are properly set up.

I tested the email server configuration using mail-tester.com, which yielded a 10/10 score, indicating proper authentication and configuration. Emails sent to Gmail and other SMTP providers successfully reach the inbox. However, emails sent to Yahoo and Outlook are consistently marked as spam.

I would appreciate any guidance on additional configurations or optimizations within aaPanel that may improve deliverability to Yahoo and Outlook. If there are specific adjustments within the server settings or any logs you would need to review, please let me know.

Thank you for your assistance.

aaPanel_Kern

Hello, are there any details I can check? Check whether the IP is in the blacklist?

aaP_haythemspintechs

@aaPanel_Kern the details just the emails for testing

aaP_radipta289

aaP_haythemspintechs
You can share the log here for further investigation, by executing this command: (adjust it based on your mail.log location).

grep "status=sent" /var/log/mail.log

and check for potential spam being sent

grep "reject" /var/log/mail.log

However, I suggest to add these to your postfix main.cf (always make backup before)

Go to postfix config located in Mail-Server --> Setting, then add:

smtpd_tls_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtp_tls_security_level = may
smtp_tls_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtp_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1

After make a change on that main.cf, restart the postfix.

You might need to apply additional headers to your email, also

aaP_radipta289

aaP_haythemspintechs
I don't think that website is good enough to test. I've tried to test mine, having same problem, Yahoo, MS365, and Outlook detected as SPAM. however, it's fine when I try manually sending to my own yahoo or outlook email.

Edit from my previous message.
RUA is used to report URI for aggregate reports. Main function:

Receive aggregate reports on email authentication
Monitor domain usage for email
Detect spoofing/phishing attempts
Track delivery success rate

So, I suggest to leave it be.

aaP_haythemspintechs

aaP_radipta289 I found this on my gmail

Could this message have anything to do with what's happening?

aaP_radipta289

aaP_haythemspintechs
Remove the rua tag.
go to your cloudflare --> Choose your site --> Email --> DMARC Management BETA
then change to their SPF, DKIM, DMARC