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...and BINGO, I can now send email to Gmail...message was received in the INBOX. We can now close this ticket. Thank you for your help and I am so glad I can keep email hosted on Cloudron.

And guess what? Now all the sites like roundcube, nextcloud, mattermost.example.com are working again - I didn't change anything....We can now close this ticket. Thank you everyone.

thank you for your input, I am double checking IPV4&6 with my VPS provider right now

My VPS provider indicated the IPV6 address is missing on Cloudflare. I have now added the AAAA record at both root and mail level and am now giving it some time to propagate before trying to send the email to gmail again. Further I am deleting the temporary smtp server Mailersend. Hopefully this solves the problem and will inform you later how it went. Thank you

Hello, I am a new Cloudron user and a Linux beginner. I love the solutions provided, however, I ran into a painful issue just on my second day and ask for your urgent help. I am unable to load my dashboard... Please see the screen shots attached! Thank you.

Screenshot 2025-08-10 135730.png

Thank you Matix. I have asked the support team of my VPS provider to look into this

Everything is working again! Thank you! My VPS provider support team said there was no DNS cache and that they simply restarted the service & that was it…they are also reactivating IPV6 that was previously deactivated for troubleshooting purposes.

Unfortunately I am still having issues with my subdomains like roundcube.example.com & nextcloud.example.com - any ideas on how to solve this? monica.example.com and piwigo.example.com are working fine..

Hi. This is the Mailer program at mail.123.com.

I'm afraid I wasn't able to deliver your message
"H2 Group Agent Request R7L Logistics LLC"
to the following addresses.

This is a permanent error; I've given up. Sorry it didn't work out.

Intended Recipients: 123@gmail.com
Failure Reason: Error: 550 5.7.25 [2604:a00:11:4573:216:3eff:fe2f:5a3d] The IP address sending this 5.7.25 message does not have a PTR record setup, or the corresponding 5.7.25 forward DNS entry does not match the sending IP. As a policy, Gmail 5.7.25 does not accept messages from IPs with missing PTR records. For more 5.7.25 information, go to 5.7.25 https://support.google.com/a?p=sender-guidelines-ip 5.7.25 To learn more about Gmail requirements for bulk senders, visit 5.7.25 https://support.google.com/a?p=sender-guidelines. af79cd13be357-7e8542c26b9si182336285a.597 - gsmtp