Can not send email

centos 7.9.2009
webmin 1.973
virtualmin 6.16 pro

We can receive email and but we are not able to send out email


can you please help us to fix this issue let me know if you can remote in

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This is when i check website server issue

Please check and let me know how to fix it

SMTP Reverse DNS Mismatch Reverse DNS does not contain the hostname More Info
SMTP Banner Check Reverse DNS does not match SMTP Banner More Info

is this is right DMARC

v=DMARC1; p=none;;; fo=1

is this make sense




just be to more clear I have Server running @

i have few domain hosted on this

can you help

this is the error when we send email to any gmail

Reporting-MTA: dns;
X-Postfix-Queue-ID: B4A084153110
X-Postfix-Sender: rfc822;
Arrival-Date: Wed, 25 Aug 2021 16:33:37 -0700 (PDT)

Final-Recipient: rfc822;
Original-Recipient: rfc822;
Action: failed
Status: 5.7.26
Remote-MTA: dns;
Diagnostic-Code: smtp; 550-5.7.26 This message does not have authentication
information or fails to 550-5.7.26 pass authentication checks. To best
protect our users from spam, the 550-5.7.26 message has been blocked.
Please visit 550-5.7.26
Prevent mail to Gmail users from being blocked or sent to spam - Gmail Help for more 550
5.7.26 information. 27si1273818pgk.571 - gsmtp

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