Hello, I'm dabbling into selfhosted mailserver for the first time and am a little confused regarding the `${MAILCOW_HOSTNAME}` and rDNS. I've given the VPS a hostname as `SRV1.HETZNER.EXAMPLE.COM` and plan to use `mail.example.com` as the webui and IMAP/SMTP address. I'll also be using the same for autoconfiguration discover as well. This server also hosts a WordPress website on `example.com` using NGINX reverse proxy that I installed bare-host. If my thinking is correct, 1. I should set rDNS for server's public IP as `SRV1.HETZNER.EXAMPLE.COM` 2. I should use ${MAILCOW_HOSTNAME} as `mail.exmaple.com` 3. Use `proxy_pass` on the bare metal NGINX and redirect `mail.example.com` webui for SOGO a et al to the mailcow's docker container 4. The authoritative DNS for the domain (I use Cloudflare) should be set as ``` # Name Type Value SRV1.HETZNER IN A 1.2.3.4 @ IN CNAME SRV1.HETZNER #This is the website mail IN CNAME SRV1.HETZNER. autodiscover IN CNAME mail.example.org. ``` Am I correct in these assumptions?

> @"afterglow4"#p22125 I should set rDNS for server’s public IP as SRV1.HETZNER.EXAMPLE.COM No. rDNS must match the `$MAILCOW_HOSTNAME`. Both must resolve back and forth the same way: - `mail.example.com` must resolve to `1.1.1.1` - rDNS of `1.1.1.1` must resolve to `mail.example.com` > @"afterglow4"#p22125 The authoritative DNS for the domain (I use Cloudflare) should be set as I'd strongly suggest setting `mail` subdomain straight as A/AAAA to the actual mailserver IP. You want to be less fancy and keep it must simple, if you really rely on email. Also make sure to not forget setting MX records and disable Cloudflare proxy.

A small confusion regarding rDNS and Mailcow Hostname

afterglow4

Hello, I’m dabbling into selfhosted mailserver for the first time and am a little confused regarding the ${MAILCOW_HOSTNAME} and rDNS.

I’ve given the VPS a hostname as SRV1.HETZNER.EXAMPLE.COM and plan to use mail.example.com as the webui and IMAP/SMTP address. I’ll also be using the same for autoconfiguration discover as well. This server also hosts a WordPress website on example.com using NGINX reverse proxy that I installed bare-host.

If my thinking is correct,

I should set rDNS for server’s public IP as SRV1.HETZNER.EXAMPLE.COM
I should use ${MAILCOW_HOSTNAME} as mail.exmaple.com
Use proxy_pass on the bare metal NGINX and redirect mail.example.com webui for SOGO a et al to the mailcow’s docker container
The authoritative DNS for the domain (I use Cloudflare) should be set as

# Name              Type       Value
SRV1.HETZNER                IN A       1.2.3.4
@                IN CNAME       SRV1.HETZNER #This is the website
mail                IN CNAME       SRV1.HETZNER.
autodiscover        IN CNAME   mail.example.org.

Am I correct in these assumptions?

pkernstock

afterglow4 I should set rDNS for server’s public IP as SRV1.HETZNER.EXAMPLE.COM

No. rDNS must match the $MAILCOW_HOSTNAME. Both must resolve back and forth the same way:

mail.example.com must resolve to 1.1.1.1
rDNS of 1.1.1.1 must resolve to mail.example.com

afterglow4 The authoritative DNS for the domain (I use Cloudflare) should be set as

I’d strongly suggest setting mail subdomain straight as A/AAAA to the actual mailserver IP. You want to be less fancy and keep it must simple, if you really rely on email.

Also make sure to not forget setting MX records and disable Cloudflare proxy.