1 Topic by BitRig (edited by BitRig 2020-06-10 03:07:38)

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Topic: Issues with mail server... or DNS

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.21.1
- Deployed with iRedMail Easy or the downloadable installer? installer
- Linux/BSD distribution name and version: Debian 10
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): SQL
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro? Not yet
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hello everyone,

I've got a small problem with my mail server.
After setting up the DNS records and reinstalling Debian yesterday, I cannot send or receive mails via internet.
There are no reports about undeliverability. Also I can't enter the interface via www, but I can ping it successfully.
Local access works perfectly.

Help is appreciated smile

Here's a screenshot of my (maybe faulty) DNS configuration.

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2 Reply by Rickeyacelp

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Re: Issues with mail server... or DNS

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3 Reply by MuPp3t33r (edited by MuPp3t33r 2020-06-10 14:53:36)

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Re: Issues with mail server... or DNS

are "mail" "office" and "www" all the same host IP address? I see you have a root MX record for both "mail" and "office"
Unless you are doing round-robin with multiple mail gateways or some kind of HA/Failover system then you should only have one MX for your root

Have you checked in /var/log/mail.log for errors when sending mails?
Login to SSH and run tail -f /var/log/mail.log then send an email and see what errors happen.

Unrelated to your issues, you should also complete your SPF and DKIM records

4 Reply by BitRig

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Re: Issues with mail server... or DNS

MuPp3t33r wrote:

are "mail" "office" and "www" all the same host IP address? I see you have a root MX record for both "mail" and "office"
Unless you are doing round-robin with multiple mail gateways or some kind of HA/Failover system then you should only have one MX for your root

Have you checked in /var/log/mail.log for errors when sending mails?
Login to SSH and run tail -f /var/log/mail.log then send an email and see what errors happen.

Unrelated to your issues, you should also complete your SPF and DKIM records

"mail" is the host. "office" has been removed, not neccessary. "www" is just the web-access. And yep, it's all the same host with same IP. I wasn't clear if SPF is complete, but DKIM is - I just deleted the key to take the screenshot smile

Well, according to some guides I probably found the mistake. After logging in to iredadmin the system info show me the hosts local ip address (192.168.XXX.XX). Shouldn't it be the public ip?

5 Reply by MuPp3t33r

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Re: Issues with mail server... or DNS

Are you hosting the server on premises or do you have it in a VPS?

6 Reply by BitRig

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Re: Issues with mail server... or DNS

MuPp3t33r wrote:

Are you hosting the server on premises or do you have it in a VPS?

Oh, I should have mentioned it. It's a virtual machine.

7 Reply by MuPp3t33r

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Re: Issues with mail server... or DNS

I assume you have set up the correct port forwards on your router?
If you can telnet to your public IP on port 25 from the internet (not your local network) then you should be set to receive incoming mails. If you cannot telnet to 25 then check your port forwards are correct and your ISP does not block port 25.

Do try what I suggested about the logs when you send an email so we can understand where it is failing.

It is correct that iRedAdmin will display the host IP, not the public, unless in a VPS for example then your host would be on a public IP

8 Reply by BitRig

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Re: Issues with mail server... or DNS

MuPp3t33r wrote:

I assume you have set up the correct port forwards on your router?
If you can telnet to your public IP on port 25 from the internet (not your local network) then you should be set to receive incoming mails. If you cannot telnet to 25 then check your port forwards are correct and your ISP does not block port 25.

Do try what I suggested about the logs when you send an email so we can understand where it is failing.

It is correct that iRedAdmin will display the host IP, not the public, unless in a VPS for example then your host would be on a public IP

My holy.... thanks for the hint with the port. I checked my router again and I had to reconfig the ip address of my server and edit the ports.

But my email provider (web.de) seems to be blocking my host. I can't receive any mails on my main accounts on the web. Receiving emails on the server works perfectly.

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(delivery temporarily suspended: host mx-ha02.web.de[212.227.17.8] refused to talk to me: 554-web.de (mxweb113) Nemesis ESMTP Service not available 554-No SMTP service 554-IP address is black listed. 554 For explanation visit https://web.de/email/senderguidelines?i … &c=bl)
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9 Reply by PaulCahill

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Re: Issues with mail server... or DNS

If you are on a consumer grade ISP and not paying for a static IP or business class internet service, then your external IP address is probably in a block of blacklisted IP's.
https://mxtoolbox.com/blacklists.aspx
For example, my home IP: 74.128.81.141 is in the blacklisted range. ISP's do this on purpose to keep spam infected machines from sending spam.

PaulCahill's Website

10 Reply by MuPp3t33r

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Re: Issues with mail server... or DNS

If you really must operate from your home network then you are likely going to have to do either of the following:

1) Upgrade your internet service package to something preferably with a static IP which does not have ISP port restrictions. (recommended)
2) Use an external mail gateway that you host in a VPS and can deliver your emails to your on-premises server via another port
3) Utilize an external mail gateway solution such as Mimecast - equivalent to the above but not a self-hosted solution. (kinda pricey but in an enterprise environment it is so well worth it)