How to improve sender score for personal mail server

Tode

1/20/24, 12:15 PM

Background:
I have an own domain and an own mail server that sends out the mail for this domain. The users are only my family so there are less than 10 users with probably 20 mails sent per day.

Please don't question why I have my own server: It is my job as a consultant to work with the server software and I use this server to test new settings / new versions before I use them in my customers' environments.

Until recently I used the relay server of my provider to relay all outgoing mails from my server. Now I changed my provider and relaying mails to their system is much more complicated as they do not have a whitelist but need authenticated connections.

Technical situation

The server has a fixed IP address
The IP address is entered in the SPF record
There is a PTR record for that address that points back to mail.mydomain.de
DMARC and DKIM are setup and strict rules are in place
IP address is whitelisted at dnswl.org

Problem description
Sending mail from that server usually works fine. Unfortunately the German Telekom denies mails from the server as its reputation is not high enough. I contacted them and they answered "We don't take mails from personal mail servers. Send your mail to a relay, otherwise we will not accept it.

They pointed me to a link that lists the reputation services they query. One of them is SenderScore and there the reputation of my IP adress is 0 (=poor). Unfortunately they don't tell me anything useful about how to improve my IP reputation.

Question
Does anybody have an idea how I can improve my mail server reputation as a private person sending 20 mails a day max?

1 + 1

smtp

spam

anx

1/21/24, 1:19 AM

Query [lists like](https://mxtoolbox.com/blacklists.aspx) Spamhaus PBL to see if others think your IP space was publicly announced as something along the lines of "don't accept unauthenticated mail from here, this IP should be using our relay"

Score:2

Server

Jon Glazer

1/20/24, 1:03 PM

Does your server host a web site? I have found that some slight bit of reputation revolves around having a public web site bound to that domain and, potentially, on that same server. At least having a web site on the domain could help.

Additionally, I have used a spam checker site such as https://www.experte.com/spam-checker that will analyze your email settings directly from an email you send it to determine it's likelihood as being seen as spam and how to improve it.

+ 4

Tode

1/20/24, 3:47 PM

There is a -password protected- private website (webmail) on that IP address...

Jon Glazer

1/21/24, 2:07 AM

Ahh, that should be ok. Did you try the mail tool I suggested? Would you mind up-marking my answer? I am trying to improve my rep here :)

Tode

1/23/24, 7:11 AM

Tried twice: Never got a result...

Jon Glazer

1/23/24, 12:13 PM

@Tode that could be a problem right there. So you copy the email address from the site and then paste it into your email program and send it (any subject and body). Then click the results button. It may take a few seconds (just sit on the page) while the server analyzes your email. and it should eventually show you a result. (Also, please up vote this conversation :) )

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