Postfix send mail problem(In RH9, kernal 2.4.20, postfix 2.1.5)
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Postfix send mail problem(In RH9, kernal 2.4.20, postfix 2.1.5)
Dear All,
I install a Postfix system for our users to send out e-mail from internal network to internet/outside and usually is working fine. But I got some bounce mail in sometimes, it's look like are as follow :
This is the Postfix program at host smtp01.domain.com.
I'm sorry to have to inform you that your message could not be
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The Postfix program
<receiver@gmail.com>: host gmail-smtp-in.l.google.com[64.233.171.27] said: 250
2.1.5 OK (in reply to DATA command)
What happening on my smtp server(postfix)? And we have a firewall (Cisco PIX 515E) in front of smtp server(postfix), is it a firewall problem to cause the problem? Or our internet line problem? I'm really no idea on this case, I really need your reply!!! Many thanks!
I can not proffer a solution to the original problem on this thread but I have troubles with configuring my postfix relayhost to send emails outside the network to the internet.
OS: oracle Linux 8.0
Virtual machine: VMware Esxi 6.5
Installed in: windows PC
I am trying to send emails from postfix server via my ISP to the thunderbird mail application on my PC.
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