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i cannot be able to send emails; port 25 is blocked

Posted December 15, 2019 1k views
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[root@ns1 ~]# telnet gmail-smtp-in.l.google.com 25
Trying 172.217.197.27…
telnet: connect to address 172.217.197.27: Connection timed out
Trying 2607:f8b0:400d:c0f::1b…
telnet: connect to address 2607:f8b0:400d:c0f::1b: Network is unreachable

please help

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eleetgeeks
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eleetgeeks

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1 answer
KFSys December 15, 2019

Hi @eleetgeeks,

It’s possible you you need to allow outgoing TCP traffic on port 25

iptables -I INPUT -p tcp -m tcp --dport 25 -j ACCEPT

Additionally, you can further read this DigitalOcean article explaining more about Iptables and what they are - https://www.digitalocean.com/community/tutorials/iptables-essentials-common-firewall-rules-and-commands

Regards,
KDSys

Iptables Essentials: Common Firewall Rules and Commands
by Mitchell Anicas
Iptables is a software firewall for Linux distributions. This cheat sheet-style guide provides a quick reference to iptables commands that will create firewall rules that are useful in common, everyday scenarios. This includes iptables examples of allowing and blocking various services by port, network interface, and source IP address.
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