I install Mail Server plugin in my panel. I can receive emails, but when I try to send mail, I get this error message: Theme:Undelivered Mail Returned to Sender when I test with https://www.mail-tester.com/ get this errors

Hello, please check whether the server's port 25 communicates normally, and the normal communication of port 25 is required to send mail.

aapanel_sniper I run sudo ufw status and sudo netstat -tulpn

kohestanimahdi No, no, it just shows that it doesn't work when the system shows that it runs. You must be able to communicate with it. For example, telnet ipaddress 25 can communicate.

kohestanimahdi Hello, check the trash can in your inbox. Have you received any mai

aaPanel_thisyear Hello, No, when I try to send mail, mail returns to my inbox. I check spam and trash in the receiver's email address. I can receive email from my google email, but can not send any mail

kohestanimahdi Please follow the tips of mailtest to improve your information. If your email score is too low, it may be rejected by other inboxes or put in the trash.

zohebnsr Google Cloud Platform don't allow any traffic using port 25, even if we create the firewall rules, or if we try to use SSL or TSL ports. There is NO way! read this : https://cloud.google.com/compute/docs/tutorials/sending-mail

I can not send email

mehadih31

Some cloud vendors (such as Google, Amazon) close port 25 by default, and you need to contact the vendor to open port 25 before you can use the post office service normally

Facing This issue, How can solve this problem?

aaP_marshupsanddowns

delays=39460/0.02/0/0, dsn=4.3.0, status=deferred (mail transport unavailable)

Aug 1 12:44:13 support-microsolutions postfix/smtp[1219464]: fatal: unknown attribute name: #
Aug 1 12:44:14 support-microsolutions postfix/master[1439]: warning: process /usr/lib/postfix/sbin/smtp pid 1219464 exit status 1
Aug 1 12:44:14 support-microsolutions postfix/master[1439]: warning: /usr/lib/postfix/sbin/smtp: bad command startup -- throttling

having this errors

aaPanel_Kern

Hello,
Is the problem solved?
Is there any more information

aaP_marshupsanddowns

Aug 2 23:40:29 support-microsolutions postfix/master[325014]: warning: /etc/postfix/main.cf, line 28: overriding earlier entry: myhostname=support-microsolutions.com
Aug 2 23:40:29 support-microsolutions postfix/master[325014]: fatal: bind 0.0.0.0 port 25: Address already in use
Aug 2 23:40:30 support-microsolutions postfix/master[325013]: fatal: daemon initialization failure
Aug 2 23:40:31 support-microsolutions postfix/postlog[325034]: warning: /etc/postfix/main.cf, line 28: overriding earlier entry: myhostname=support-microsolutions.com
Aug 2 23:40:31 support-microsolutions postfix/postfix-script[325034]: fatal: mail system startup failed

aaPanel_Kern

aaP_marshupsanddowns Aug 2 23:40:29 support-microsolutions postfix/master[325014]: fatal: bind 0.0.0.0 port 25: Address already in use

Hello, other software is prompted to be unable to start due to using port 25

aaP_marshupsanddowns

I get that

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