I thought I had, and I do. OVH is allocating my PTR in a group of 8 addresses (ip-54-39-185.eu.). May be that's where the problem lies? I sent a ticket to OVH.

$ dig -x 54.39.185.225

; <<>> DiG 9.11.4-3ubuntu5-Ubuntu <<>> -x 54.39.185.225
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25851
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;225.185.39.54.in-addr.arpa.    IN    PTR

;; ANSWER SECTION:
225.185.39.54.in-addr.arpa. 5990 IN    PTR    ip-54-39-185.eu.

https://mxtoolbox.com/subnet/?filter=54.39.185.225/29&source=findmonitors&domain=54.39.185.225

Do you have reverse DNS records set up -- this is pretty much a requirement for running any mail server these days.

This mailing list kept getting blocked by Spamhaus when we used IPv6 address to send out mail. I have no idea what was wrong with that, but the minute I turned off IPv6 everything went back to normal.

I remember there's an open-source mail config/blacklist checking website tool, but I don't remember its name.

Alex.

On 2019-02-21 1:24 p.m., Marc Lijour via talk wrote:

Does anyone has insights about dealing with Spamhaus?

I'm getting increasingly frustrated by being listed without explanation. I run a very low bandwidth mail server and a website for my business. I am running postfix with SPF, DKIM, and DMARC. I'd like to know what I am missing.

Spamhaus is very popular which in turn affects Twitter, LInkedIn, beyond just the mail.

Is it possible to run one's own mail server this days?

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