Mail received but not sent

Hello. Help please, cant sent mail, but received. If send from my to my all fine, but if send to any another post not sending.
Check port 25 for ip of host is open, but if check port 25 for sitename sample.com which on cloudflare this port is closed.

MX name:sample.com Content: sample.com

Please use the search, that has been addressed a million times.

You can also look for “Troubleshooting Email Delivery Issues when using Cloudflare” under #Tutorials.

Thanks. Try to do all from Troubleshooting but nothing change.
Can you tell me please what to do?
Now:
MX name:sample.com content:sample.com
A mail 1.1.1.1. not proxy

Well, MX is responsible for receiving emails, which apparently is not the problem in your case. You’ll be connecting somewhere in your code to a proxied record instead and you need to make sure that record is not proxied.

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