CentOS 7.9 problem with mail

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ssemla
Posts: 4
Joined: 2023/10/04 14:20:10

CentOS 7.9 problem with mail

Post by ssemla » 2023/10/04 16:12:27

Hello everyone! I have a problem with my CentOS. I need to send an email from the command line (mail) but when I try to do it I get a message “smtp-server: This IP [10.0.0.3] is blocked.” 10.0.0.3 is my local IP address. As far as I remember I use postfix. I have no idea what generates this message whether firewall or postfix itself because I did not find anything in the logs. Please help me where to look for the cause of this problem. On the firewall I have ports open in postfix it seems to me that it is also ok (I can log in telnet).
Last edited by ssemla on 2023/10/04 17:30:11, edited 1 time in total.
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TrevorH
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Joined: 2009/09/24 10:40:56
Location: Brighton, UK

Re: CentOS 7.4 problem with mail

Post by TrevorH » 2023/10/04 16:49:16

Start by updating from 7.4 which went out of support as soon as 7.5 was released in 2018-04-10. Your system is more than 5 years out of date and has numerous security problems that are known and abused by malicious actors.
The future appears to be RHEL or Debian. I think I'm going Debian.
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
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ssemla
Posts: 4
Joined: 2023/10/04 14:20:10

Re: CentOS 7.4 problem with mail

Post by ssemla » 2023/10/04 16:55:58

I have CentOS 7.9 (sorry(
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