1 Topic by dittman

  • dittman
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  • Registered: 2015-08-15
  • Posts: 82

Topic: Secondary MX record pointing to the primary server

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.7.4
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version: Rocky 10.1
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MariaDB
- Web server (Apache or Nginx):NGINX
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I have a failover Internet connection on my router.  It also has a static IP.  The only issue is I can't get a PTR record created, so I was thinking that perhaps I could use it for incoming mail if there's an issue with the primary and just avoid using it for outgoing email since the PTR record wouldn't match and there's a high probability it would be rejected due to that.

Intead of doing tricks with DNS resolution I was wondering if instead I could designate the failover IP as a lower priority MX record so the incoming mail would still arrive.  Would that cause any issues?

For example I'd have:

main.com  3600 IN MX 10 mail.main.com
main.com. 3600 IN MX 20 failover.main.com

----

Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2 Reply by jackb

  • jackb
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  • From: Ireland
  • Registered: 2019-05-06
  • Posts: 130

Re: Secondary MX record pointing to the primary server

dittman wrote:

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.7.4
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version: Rocky 10.1
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MariaDB
- Web server (Apache or Nginx):NGINX
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I have a failover Internet connection on my router.  It also has a static IP.  The only issue is I can't get a PTR record created, so I was thinking that perhaps I could use it for incoming mail if there's an issue with the primary and just avoid using it for outgoing email since the PTR record wouldn't match and there's a high probability it would be rejected due to that.

Intead of doing tricks with DNS resolution I was wondering if instead I could designate the failover IP as a lower priority MX record so the incoming mail would still arrive.  Would that cause any issues?

For example I'd have:

main.com  3600 IN MX 10 mail.main.com
main.com. 3600 IN MX 20 failover.main.com

Best practise is mx1 priority 10, mx2 Priority 20. Both mail exchangers requires PTR Records. Which is handles by the ISP. Port 25 is blocked on residential Internet Connections.

If you are on a residential Internet connection then your alternative is to look at a SMTP Relay Service.