Gmail not able to connect to my SMTP server

[AL-Kateb]

Hello everybody, I am having a problem and I thought you guys could help.

I'm adding another account to my Gmail account that I wish to send and receive emails from, when I choose the option to send email through "Mywebsite" SMTP, I provide my details and I receive the message:

"Your other email provider is responding too slowly. Please try again later or contact the administrator of your other domain for further information."

I have Exim setup on my server, and it's running on port 25 so I've chosen port 25 unsecured I still get this error.

At first I thought IpTables might be blocking the connection for some reason so I disabled it and tried again but that did not help.

The process is happening under 5 seconds so this can't be a timeout issue. The message is quiet clear! Taking too long! But it isn't. I have tried sending from outlook, and from webmail and it works just fine.

So what can I do to troubleshoot this issue?

I have posted this question on Google forums, someone suggested that it's because exim is using self-signed certificate, and he suggested that I disable advertising TLS, I do not think this is the issue, I was running this exact same setup and I never had this issue before, I recently have moved my websites to a new hardware and it is then when I started receiving this message.

I am ABLE to send/receive using secure and unsecured settings using outlook or webmail, but not using this Gmail's feature.

And BTW, gmail can connect to POP3 and receive messages as expected
So any idea what this could be?

 

[cPanelPeter]

Hello,

Still sounds like a firewall issue. Is there perhaps an upstream firewall (at your host perhaps)? Try running an nmap to see if all the ports that are expected to be open are in fact open.

 

[AL-Kateb]

I am able to connect to ports (25) and (465) using MS Outlook with no problem, and there are no IPs blocked I've flushed them all. And above all that I've disabled the firewall and tried it did not work. By default iptables is the firewall installed and I'm managing it using CSF.

I was also able to connect to it using telnet, so no firewall issue here, maybe Gmail's has got some sort of blacklist it tests against? Even though my messages are being delivered to inbox I guess so I don't know.

Should I submit a ticket or it isn't the kind of thing I can ask support for from cPanel?

 

[cPanelPeter]

Hello,

Feel free to open a support ticket using the link in my signature. We'll be happy to take a look and if it turns out that it is not supported, we'll let you know, but we do try to guide you as much as possible to a solution.

 

[sahostking]

What was the solution for this issue?

 

[cPanelMichael]

What was the solution for this issue?

Are you experiencing the same issue? If so, could you elaborate on what solutions you have tried thus far? The original poster did not submit a ticket or post a ticket number for us to investigate further.

Thank you.

 

[dxer]

Aware that this thread is old but I would like to hear solution to this problem as it seems clients on my server are having the same problem. I tested this and found that issue can be partly solved by disabling CSF. Nevertheless in this case only combination with hostname as mail server+ port 465 + SSL works. only this combination works. When CSF is enabled nothing works.

Can anybody offer solution to fix this problem ?

 

[cPanelMichael]

Hello

Check to see if any of the settings referenced in this thread help address the issue:

Disabling firewall IP blocking on POP3/SMTP/webmail login failures

Thank you.

 

[dxer]

This thread is discussing wrong login attempts and how to provide users to have more login attempts before being blocked, if they are entering wrong password.
Here we have this option where GMAIL interface can be use as Outlook for example so user can check and send mails from their domains on my server , but through GMAIL interface. In the step where you need to enter this email access data, Google respond with "Your other email provider is responding too slowly". I tried different combination for the mail server (hostname and specific domain mail server) , port and encryption which is given but all failed. IP tables are flushed and nothing is helping except when I disable CSF. When firewall is disabled it is working but only option where SMTP server is server hostname, port 465 and SSL as encryption.

What is this about ? I found some threads through the years but seems noone can solve this.

 

[cPanelMichael]

Could you verify if "Introduce a delay into the SMTP transaction for unknown hosts and messages detected as spam" is enabled? It's documented at:

Exim Configuration Manager - Basic Editor - Documentation - cPanel Documentation

Thank you.

 

[dxer]

Thanks, it seems this did the trick. I disabled this option and now Google verified my mail server with port 25 and TLS secured connection.
However if I want to enter SMTP server as server hostname and select port 465 , this way it is still not working.
Maybe it is still CSF. Where in CSF configuration should port 465 be opened ?

 

[cPanelMichael]

Hello

This third-party URL may help:

Configure CSF to allow outbound SMTP

Thank you.