In my DNS configuration I've got
Name Type TTL Value
gest A 1800 12.34.56.789
Does it mean that every emails sent to @gest.mydomain.com will be handled by a mail server (if any) on 12.34.56.789 ?
In my DNS configuration I've got
Name Type TTL Value
gest A 1800 12.34.56.789
Does it mean that every emails sent to @gest.mydomain.com will be handled by a mail server (if any) on 12.34.56.789 ?
The sending SMTP server will attempt delivery for email messages to @gest.example.com
addresses first by looking up the MX
record for gest.example.com
In the absence of a MX
record for gest.example.com
RFC 5321 provides a fallback mechanism:
If an empty list of MXs is returned, the address is treated as if it was associated with an implicit MX RR, with a preference of 0, pointing to that host.
In other words: when your DNS only has the following record:
Name Type TTL Value
gest A 1800 10.34.56.789
SMTP servers should treat that as if the following MX record exists:
Name Type TTL Value
gest MX 0 0 gest.example.com.
gest A 1800 10.34.56.789
and route mail accordingly.
So yes, messages to @gest.example.com
should be sent to the host with the gest.mydomain.com
A
record i.e. to 10.34.56.789