Email sending to gmail is not working.

[YesitsRafid]

Hello,

When I try to send an email from my Gmail to my cPanel the mail is received. But if I send something to a Gmail account an error occurs. If I try to send another provider, it works.


---------------------------

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
(ultimately generated from [email protected])
retry timeout exceeded
Reporting-MTA: dns; zap.reallyfastserver.com

Action: failed
Final-Recipient: rfc822;[email protected]
Status: 5.0.0

Subject	Test By Rasel
From	Mohshin
To	[email protected]
Date	Today 18:30

Test By Rasel

--------------------------------

 

[kodeslogic]

Can you share the output for the following command on your server:

$ telnet smtp.gmail.com 587

 

[YesitsRafid]

Hey, I used it, and it says command not found.

 

[kvngwitty]

Got the same error and ive not been able to send mails to Gmail also

 

[kodeslogic]

Install telnet using:

# yum install telnet -y

then the telnet command should work

 

[kvngwitty]

this is the response i get when I tried to install telnet

 

[ServerHealers]

Instead, you could use the following commands and share the outputs:

nc smtp.gmail.com 587

nc smtp.gmail.com 25

 

[kvngwitty]

Instead, you could use the following commands and share the outputs:

[[email protected] ~]$ nc smtp.gmail.com 587
220-ip-172-31-19-103.us-east-2.compute.internal ESMTP Exim 4.95 #2 Thu, 01 Dec 2022 16:43:24 +0000
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
nc smtp.gmail.com 25
500 unrecognized command

 

[ServerHealers]

View attachment 80509

this is the response i get when I tried to install telnet

In order to install this, you have to switch to root user or run it with sudo as follows:

To switch to root user:

sudo -i

To run as current user centos:

sudo yum install telnet -y

[[email protected] ~]$ nc smtp.gmail.com 587
220-ip-172-31-19-103.us-east-2.compute.internal ESMTP Exim 4.95 #2 Thu, 01 Dec 2022 16:43:24 +0000
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
nc smtp.gmail.com 25
500 unrecognized command

Looks like the server has connection to Gmail SMTP server, however, the second command seems ran incorrectly there. Run below command correctly from your terminal, not from inside nc prompt.

nc smtp.gmail.com 25

 

[kvngwitty]

In order to install this, you have to switch to root user or run it with sudo as follows:








Looks like the server has connection to Gmail SMTP server, however, the second command seems ran incorrectly there. Run below command correctly from your terminal, not from inside nc prompt.

Using username "centos".
Authenticating with public key "imported-openssh-key"
Last login: Thu Dec 1 16:43:00 2022 from 197.211.58.185
[[email protected] ~]$ sudo -i
[[email protected] ~]# sudo yum install telnet -y
Loaded plugins: fastestmirror, universal-hooks
Loading mirror speeds from cached hostfile
* EA4: 63.247.64.58
* cpanel-plugins: 63.247.64.58
* base: download.cf.centos.org
* extras: download.cf.centos.org
* updates: download.cf.centos.org
Resolving Dependencies
--> Running transaction check
---> Package telnet.x86_64 1:0.17-66.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
telnet x86_64 1:0.17-66.el7 updates 64 k

Transaction Summary
================================================================================
Install 1 Package

Total download size: 64 k
Installed size: 113 k
Downloading packages:
telnet-0.17-66.el7.x86_64.rpm | 64 kB 00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : 1:telnet-0.17-66.el7.x86_64 1/1
Verifying : 1:telnet-0.17-66.el7.x86_64 1/1

Installed:
telnet.x86_64 1:0.17-66.el7

Complete!
[[email protected] ~]# nc smtp.gmail.com 587
220 smtp.gmail.com ESMTP b11-20020a92dccb000000b002f139ba4135sm2626705ilr.86 - g smtp
nc smtp.gmail.com 25
502 5.5.1 Unrecognized command. b11-20020a92dccb000000b002f139ba4135sm2626705ilr .86 - gsmtp

 

[ServerHealers]

Looks like, you are running the nc commands wrong. Run the below command separately instead of from inside the nc prompt of towards 587.

nc smtp.gmail.com 25

OR

telnet smtp.gmail.com 25

Run above command once you logged into the server, and share the outputs here.