"Use MX" checkbox under "Transports"

[William Edwards]

There is a checkbox called "Use MX" under "Transports" (when adding or editing a domain name). I cannot find the meaning of this checkbox anywhere, not in the admin guide either.


Dialog under Transports

What does this checkbox do?

 

[tom]

https://en.wikipedia.org/wiki/MX_record

if you enable this, the MX record for the domain is used.

 

[William Edwards]

https://en.wikipedia.org/wiki/MX_record

if you enable this, the MX record for the domain is used.

So if I check "Use MX" and leave 'Host' empty, mail would arrive on the mail server in the MX record?
If so, why would I leave it checked when entering a host?

Edit: seems like I cannot leave 'Host' empty.

 

[tom]

So if I check "Use MX" and leave 'Host' empty, mail would arrive on the mail server in the MX record?
If so, why would I leave it checked when entering a host?

Edit: seems like I cannot leave 'Host' empty.

You need to use the setting based on your configuration and DNS settings, you cannot leave host empty.

 

[William Edwards]

You need to use the setting based on your configuration and DNS settings, you cannot leave host empty.

Sorry, I really do not understand. If I check "Use MX", you say the MX record for the domain is used. Used for what? Delivering mail to? If so, why would I have to input a host?

 

[tom]

Sorry, I really do not understand. If I check "Use MX", you say the MX record for the domain is used. Used for what? Delivering mail to? If so, why would I have to input a host?

yes, for email delivery. you can also use a DNS name as "Host". If you have multiple MX records for a domain, using MX records is useful.

 

[William Edwards]

yes, for email delivery. you can also use a DNS name as "Host". If you have multiple MX records for a domain, using MX records is useful.

Ah, ok. In conclusion: I have only one mail server to deliver mail to and just 2 MX record (2nd is fallback), so I could just as well not tick "Use MX"?

 

[tom]

If you have just one email server why do you use transports?

 

[William Edwards]

If you have just one email server why do you use transports?

Sorry for being unclear. I don't have just one mail server. I have about 30. I mean each customer domain has just 2 MX records (the primary one and fallback). I will put PMG in front of the actual mail server, so I don't have ClamAV eating resources everywhere.

 

[jlar310]

yes, for email delivery. you can also use a DNS name as "Host". If you have multiple MX records for a domain, using MX records is useful.

Can I get a clarification? I am interpreting "use a DNS name as Host" to mean, use the mail domain name as Host, not an actual server hostname, when ticking "Use MX". Is that correct?

 

[heutger]

If you enter an IP as host name, this IP address is used, no other options.
If you enter a FQDN (aka DNS name) as host name without further options, this FQDN is used.
If you enter a FQDN (aka DNS name) as host name with Use MX ticked, the MX record of the FQDN is used (not(!) the MX record only of the domain itself without any given subdomain) so it could be used, if you have multiple mail servers behind, which you prioritize via MX records like MX 10 primary mailserver, MX 20 secondary mailserver. If you use a FQDN, e.g. mail.domain.tld, you don't refer to the MX of domain.tld (as mentioned above) but are required to also set mail.domain.tld IN MX 0-xxx FQDN in your DNS records to be able to use them.

 

[matze1]

If you enter an IP as host name, this IP address is used, no other options.
If you enter a FQDN (aka DNS name) as host name without further options, this FQDN is used.
If you enter a FQDN (aka DNS name) as host name with Use MX ticked, the MX record of the FQDN is used (not(!) the MX record only of the domain itself without any given subdomain) so it could be used, if you have multiple mail servers behind, which you prioritize via MX records like MX 10 primary mailserver, MX 20 secondary mailserver. If you use a FQDN, e.g. mail.domain.tld, you don't refer to the MX of domain.tld (as mentioned above) but are required to also set mail.domain.tld IN MX 0-xxx FQDN in your DNS records to be able to use them.

Old but still good.
This has to be a FAQ and i miss this explanation in the pmg-docs.

 

[Andrei9385]

The pmg doc is really bad. No examples