Hello everyone! I am new to Mailcow and would like to confirm if my DNS setup is sound. I think I got all the bases covered. I have two domains: example1.com and example2.com Mailcow is installed on a fresh server with the PTR mail.example1.com DNS setup taken from Linode, apologies if the format is a bit odd: example1.com mail.example1.com MX priority 10 mail A 1.2.3.4 mail AAAA a.b.c.d autoconfig CNAME mail.example1.com autodiscover CNAME mail.example1.com @ TXT v=spf1 mx ip4:1.2.3.4 all dkim._domainkey TXT <generated in Mailcow UI> _dmarc TXT v=DMARC1; p=reject; rua=mailto: mailauth-reports@example1.com imap. tcp SRV priority 0, weight 1, port 143 mail.example1.com (along with the rest of the SRV records in this fashion) example2.com mail.example1.com MX priority 10 mail.example1.com A 1.2.3.4 mail.example1.com AAAA a.b.c.d autoconfig CNAME mail.example1.com autodiscover CNAME mail.example1.com @ TXT v=spf1 mx ip4:1.2.3.4 all dkim._domainkey TXT <generated in Mailcow UI> _dmarc TXT v=DMARC1; p=reject; rua=mailto: mailauth-reports@example2.com imap. tcp SRV priority 0, weight 1, port 143 mail.example1.com (along with the rest of the SRV records in this fashion) Is the above setup correct for both domains? Do I need to change anything in the records for the second domain (example2.com) to use mail.example2.com when configuring IMAP & SMTP in mail clients? For some reason, it only works if I use mail.example1.com. I apologise if my post is lengthy and I thank you in advance for your assistance! Looking forward to your feedback.

Multiple Domains DNS Setup

BP0000

Hello everyone!

I am new to Mailcow and would like to confirm if my DNS setup is sound. I think I got all the bases covered.

I have two domains: example1.com and example2.com
Mailcow is installed on a fresh server with the PTR mail.example1.com

DNS setup taken from Linode, apologies if the format is a bit odd:

example1.com

mail.example1.com MX priority 10
mail A 1.2.3.4
mail AAAA a.b.c.d
autoconfig CNAME mail.example1.com
autodiscover CNAME mail.example1.com
@ TXT v=spf1 mx ip4:1.2.3.4 _all
dkim._domainkey TXT <generated in Mailcow UI>
_dmarc TXT v=DMARC1; p=reject; rua=mailto:mailauth-reports@example1.com
imap.tcp SRV priority 0, weight 1, port 143 mail.example1.com (along with the rest of the SRV records in this fashion)

example2.com

mail.example1.com MX priority 10
mail.example1.com A 1.2.3.4
mail.example1.com AAAA a.b.c.d
autoconfig CNAME mail.example1.com
autodiscover CNAME mail.example1.com
@ TXT v=spf1 mx ip4:1.2.3.4 _all
dkim._domainkey TXT <generated in Mailcow UI>
_dmarc TXT v=DMARC1; p=reject; rua=mailto:mailauth-reports@example2.com
imap.tcp SRV priority 0, weight 1, port 143 mail.example1.com (along with the rest of the SRV records in this fashion)

Is the above setup correct for both domains?

Do I need to change anything in the records for the second domain (example2.com) to use mail.example2.com when configuring IMAP & SMTP in mail clients? For some reason, it only works if I use mail.example1.com.

I apologise if my post is lengthy and I thank you in advance for your assistance!

Looking forward to your feedback.

michalwo

I’ll refresh this topic.
I have the same problem.
When I configure Thunderbird it shows the configuration is correct, but after that, it shows an error that I can’t log in.

When I use mail.example1.com everything works, but when I use mail.example2.com it won’t work.

Could you direct me what I am doing wrong?

CRK1918

Today I set it up for both domains and it works.

jiapei100

CRK1918 Can you please provide your solution? How did you manage to do that? Thank you …

CRK1918

jiapei100
multiple domain on single mailcow-dockerized mail server
Make sure your primary domain is set up and got a certificate, then read that post in the ‘add-another-domain-to-mailcow’ section: https://hatembentayeb.hashnode.dev/mailcow-setting-up-a-full-featured-self-hosted-mail-server#add-another-domain-to-mailcow

If you follow that post, you want to try to edit SAN for a second in your mailcow.conf (source: https://community.mailcow.email/d/206-mailcow-ignores-additional-san-in-config ),

otherwise, (note: I haven’t tried that method)

pay attention to the common area in that post, which is at mailcow/mailcow-dockerized1595

If the second domain has no TLS, try to edit that in mailcow.conf:

Skip IPv4 check in ACME container - y/n

SKIP_IP_CHECK=y

Other reference: mailcow/mailcow-dockerized517 (I see you also over there, you might also notice already 😉)