Exim error T=remote_smtp: retry time not reached for any host after a long failure period

exim -bvs does not verify communication with the email address nor if the address is a real address on the recipient server, it only verifies that it is properly formatted as an email address that Exim can understand.

the thing you might want to try from the server where Exim is installed is the following command:

telent domainAAA.com 25

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If you get a response back, then great, it is not a firewall issue.
But, if you do not get a response back, it could be a firewall issue, it could be your Internet provider blocking port 25 traffic. You might try using th etelnet trick on other well known ports that might answer at the same domain like 80 or 443 because there is usually always a web server on a mail server. If you get a response back from the port 80 test but not port 25, I would look more at the ISP. If you do not get any response from any port, I would look internally at firewalls on the router, iptables, etc.

Hi Technodweed,

The telnet to mail.domainAAA.com 25 is successful. So meaning that the connection and routing between these two servers has no issue. Please correct me if I am wrong.

What will be the cause or possibilities, these emails have been frozen in the mail queue?


Thanks!

Regards,
G2020

Have you considered the receiving end is the problem, not your side?

I have another exim server. Exaxtly same. But This server can send out to mail server of domainAAA.com. i suspect the problem is from sending server.

can you send a test email and capture the local server log for the entire attempt and post it?

yes to me also it seems problem with sending server so check the DNS settings and if possible create caching only name server to get better results

TY/SA

DNS was something suggested already here in comment id#39876112

TY/SA

Vendor not sure the root cause but they have fixed the sending issue with this solution.