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

I hope there is an easy & not too technical solution to this issue... if it gets too technical & complicated I will have to resort to hosting my email elsewhere

The reverse DNS address at my VPS provider is correctly showing mail.123.com and all Cloudron email settings show green checkmarks.

In an effort to troubleshoot, I tried setting up a free external SMTP Server on one of my domains through mailersend.net and after sending an email, I did not get any error message, but the email also did not reach its intended recipient.

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

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.

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..

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.

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

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