Email marked as spam.

nouipoz · 22 Jan

Hello everyone,

I just installed a Mailcow server on a server with a clean IP that is not on any blacklist. I have configured everything for the domain: DNS records, DKIM, SPF, but when I send emails to Gmail, they are considered spam. However, everything seems fine when I check the email header, everything looks good :

When I analyze the email header with MXToolbox, I get the following: :

However, when I test the DKIM key using a tool, the key is valid.

Do you have any idea where the problem might come from?
I have seen online that it could be related to the webmail adding a header, which is then seen negatively by mail servers. I’m not sure if the issue could come from that.

Thanks in advance

EETNyx · 22 Jan

DNS cache,… did you check if MXToolbox have the correct answer? Or just wait at least TTL and test again.

nouipoz · 22 Jan

Thank you for your response.
Yes, I waited for over 48 hours for the DNS propagation.

EETNyx · 23 Jan

Ok than, this looks like your server is signing using different private key in pair to your public key inside DNS, usually this is user error on DNS side, double check your DNS settings, if this is right, than we do not have sufficient level information to help you. For example send mail to mail-tester.com and send here result link so we can see more than some screen

nouipoz · 23 Jan

However, everything seems to be good at DNS, here is the link: Spam Test Result

mail-tester.com

Spam Test Result

You sent us an email? Check here if it passed our tests

Thank you for your help

EETNyx · 24 Jan

Also I do not see any error, sorry,… Maybe someone smarter than me @DocFraggle @esackbauer ?

esackbauer · 24 Jan

nouipoz everything seems to be good at DNS,

DNS seems fine but if you expand the results there is this:

Seems your IP address has a bad reputation.

nouipoz · 24 Jan

esackbauer
Thank you for taking the time to check, but where do you see that my IP has a bad reputation?

When I scroll down to the bottom of the test, it says: “Your server is not blocklisted. It compares your server’s IP address with 24 of the most common IPv4 blacklists.” And on mxtoolbox.com, I also don’t see my IP being blacklisted.

esackbauer · 24 Jan

nouipoz
That is referring to DNS blocklists, whereas the senderscore is something different.

nouipoz where do you see that my IP has a bad reputation?

It is in the second section “SpamAssassin likes your mail”

nouipoz · 24 Jan

esackbauer

Ah, indeed, I just saw it, I hadn’t noticed it…
Do you know how I can resolve the reputation issue with my IP?

Yet, when I check on the SenderScore website :

You’re in the clear!

The IP address is not currently listed on the Return Path Blocklist.

Note: This free tool only checks for active listings on the Return Path Blocklist (RPBL). If your IP address was previously listed on the RPBL but has since been removed, you will not see information related to that listing.

esackbauer · 24 Jan

Search the forum, there are others using gmails postmaster tools and whitelist your domain, that could help.
Otherwise you have to look the full SMTP headers of the mail as it was received in gmail, not just a screen capture of 3 lines.

nouipoz · 24 Jan

esackbauer

Unfortunately, I am already registered with postmaster tool, and it doesn’t make any difference…
Here is the full source: Received: by 2002:a05:6359:e8c:b0:1d3:496e:23e3 with SMTP id hr12csp874768rwb; - Pastebin.com

Pastebin

Received: by 2002:a05:6359:e8c:b0:1d3:496e:23e3 with SMTP id hr12csp874768rwb; - Pastebin.com

Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.

esackbauer · 24 Jan

Strange. So far it looks good. Still could be that there is a google internal list, or the content of the mail is triggering.
Try to send some more mails with “reasonable” content. Mark them in gmail as “not junk”. And answer the mails with gmail. Eventually gmail will learn that its not spam.

Dvalin21 · 24 Jan

I had this issue before, and it resolved itself. I can’t tell you how long it took, but my email was doing the same thing and had a score of 5.5 or some where around there with mail-tester.com. Now it’s 9.1

nouipoz · 24 Jan

Dvalin21

I’m trying to find a way to contact Google support, but I can’t find anything…

Dvalin21 · 24 Jan

nouipoz I didn’t contact them, however when testing the email I sent it to my Gmail which is why I knew it was going to spam. The only thing I did was mark it as not spam.

nouipoz · 24 Jan

Dvalin21 Yes, I have already marked it as not spam, but it only works for the specific account and not for the other users.

Dvalin21 · 24 Jan

nouipoz I couldn’t tell ya more. If you find a further solution please let us know. When this happened to em, it was after I added a second domain