Mail Server Not Working

[pmai72]

Can't sending and receiving email from a mail server behind pfsense.
Open Ports 25, 143, 587, 80, 443 for a mail server and MX record is pointing to the Public IP Address.
I can access a webmail using hostname from outside world.
But I don't know what i'm missing PLEASE HELP!!!

[viragomann]

@pmai72
The SMTP clients log should shed some light here.
What do you get on the client when trying to connect?

[pmai72]

@viragomann
I'm using Gmail try to send a email but getting a message back is Address not found - The response from the remote server was: 550 No Such User Here.
When I setup mail server behind ISP Modem Router before pfsense and it working no problems. I know pfsense has stop the connection.

[viragomann]

@pmai72
So that indicates that GMail can access the server, but the mail address is not known by the server.

[pmai72]

@viragomann
Sorry Gmail can't access to a server. Mail server look like it running but Can't sending and Receiving from everyone email.

[pmai72]

@viragomann
Try to send email and sitting at Queue Manager. Not Sending
@.com ***@gmail.com (Host or domain name not found. Name service error for name=gmail.com type=MX: Host not found, try again)

[viragomann]

@pmai72 said in Mail Server Not Working:

Name service error for name=gmail.com type=MX: Host not found

Seems that the server cannot resolve host names.
You should check the DNS settings.

[pmai72]

@viragomann
Where do I check DNS settings is it in pfsense or elsewhere.
Can I ask you a question?
If I connect mail server direct to ISP modem and it's work perfectly with no problems.

[pmai72]

@viragomann
Could be pfsense NAT port forwarding not function properly.

[viragomann]

@pmai72 said in Mail Server Not Working:

Where do I check DNS settings is it in pfsense or elsewhere.

On the server.

Presumably the server used the ISP router for DNS resolution which is not available anymore.
So you might have to change the DNS settings on the server to use pfSense.

[Gertjan]

If gmail tells you :

@pmai72 said in Mail Server Not Working:

The response from the remote server was: 550 No Such User Here

Then that message : "550 No Such User Here" came from the server where you tried to send the message to.
That should be your mail server.

@pmai72 said in Mail Server Not Working:

@viragomann
Where do I check DNS settings is it in pfsense or elsewhere.
Can I ask you a question?
If I connect mail server direct to ISP modem and it's work perfectly with no problems.

Use for example this one :

https://www.zonemaster.net/domain_check

And this one : https://ssl-tools.net/

Or https://tls.imirhil.fr/ ( select smtp )

[pmai72]

@gertjan
Somehow I can receiving a email now but can't send. Is it still something missing?

[Gertjan]

@pmai72 said in Mail Server Not Working:

Is it still something missing?

Probably. Can't tell right now.
You have world's most famous log file at your disposal. It's the file nearly every post (=mail) master looks at 24/24H, as it is very important.

/var/log/mail.log

It has all the details.

edit : /var/log/mail.log is the file and location for most mail servers.