MX Record (Mail Exchange Record)
These records is used yesteryear post service servers to decide where to deliver email. MX records should alone map to Influenza A virus subtype H5N1 records (not CNAME records). If an MX tape is missing for the domain the post service for the domain volition unremarkably live attempted to live delivered to the matching Influenza A virus subtype H5N1 record. So for the domain “example.com” if at that spot were no MX records for “example.com” thence the post service would live attempted to delivered to the apex / rootage tape of “example.com”.
These records is used yesteryear post service servers to decide where to deliver email. MX records should alone map to Influenza A virus subtype H5N1 records (not CNAME records). If an MX tape is missing for the domain the post service for the domain volition unremarkably live attempted to live delivered to the matching Influenza A virus subtype H5N1 record. So for the domain “example.com” if at that spot were no MX records for “example.com” thence the post service would live attempted to delivered to the apex / rootage tape of “example.com”.
Name: This is unremarkably e'er left blank for MX records. This volition live the host for your domain which is genuinely a figurer inside your domain. Your domain cite is automatically appended to your name. So if you lot exit it blank it volition live the instructions on where to shipping electronic mail for your domain (ie. username@example.com).
Server: This volition live the host (the post service server) that volition get got post service for the host that is specified inwards the cite field. Your domain cite is automatically appended to your value if it does non cease it a dot.
MX Level: The MX degree determines the gild (which post service server) that your post service volition live attempted to live delivered. The post service server amongst the lowest MX degree volition get live attempted to get got the electronic mail delivered.
So if you lot hade 3 MX records amongst levels 10, 20, thirty the next would occur:
Mail would e'er live get tried to live delivered to the MX tape amongst MX Level of 10. If that post service server is downwards thence the post service volition show to live delivered to the post service server at 20. If the post service server at degree twenty is downwards thence the post service volition live attempted to live delivered at the post service server at degree 30. If the post service servers at degree twenty as well as thirty are backup post service servers thence the post service volition live delivered to the post service server at degree 10 when it comes dorsum online.If you lot get got multiple MX records amongst the same MX degree thence it volition setup a circular robin configuration for your email. The sending electronic mail server volition non shipping electronic mail to both electronic mail servers.
Mail would e'er live get tried to live delivered to the MX tape amongst MX Level of 10. If that post service server is downwards thence the post service volition show to live delivered to the post service server at 20. If the post service server at degree twenty is downwards thence the post service volition live attempted to live delivered at the post service server at degree 30. If the post service servers at degree twenty as well as thirty are backup post service servers thence the post service volition live delivered to the post service server at degree 10 when it comes dorsum online.If you lot get got multiple MX records amongst the same MX degree thence it volition setup a circular robin configuration for your email. The sending electronic mail server volition non shipping electronic mail to both electronic mail servers.
TTL: The TTL (Time to Live) is the amount of fourth dimension your tape volition remain inwards cache on systems requesting your tape (resolving nameservers, browsers, etc.). The TTL is fix inwards seconds, thence threescore is i minute, 1800 is thirty minutes, etc..
Systems that get got a static IP should usually get got a TTL of 1800 or higher. Systems that get got a dynamic IP should usually get got a TTL of 1800 of less.
The lower the TTL the to a greater extent than oftentimes a customer volition take away to interrogation the cite servers for your host’s (record’s) IP address this volition number inwards higher interrogation traffic for your domain name. Where equally a really high TTL tin give the axe motility downtime when you lot take away to switch your IPs quickly.
Best Practice Tip
If you lot excogitation on changing your IP you lot should fix your TTL to a depression value a few hours earlier you lot brand the change. This agency you lot won’t get got whatsoever downtime during the change. Once your IP is changed you lot tin give the axe e'er enhance your TTL to a higher value again.
If you lot excogitation on changing your IP you lot should fix your TTL to a depression value a few hours earlier you lot brand the change. This agency you lot won’t get got whatsoever downtime during the change. Once your IP is changed you lot tin give the axe e'er enhance your TTL to a higher value again.
Example 1 – Simple MX tape inside the same domain:
| NAME | TTL | TYPE | DATA | MX LEVEL |
| mail1.example.com. | 1800 | A | 192.168.1.2 | |
| example.com. | 1800 | MX | mail1.example.com. | 10 |
Configuration:
A record: For the Influenza A virus subtype H5N1 tape configuration explanation delight read to a greater extent than inwards the Influenza A virus subtype H5N1 – Data Entry page.
MX tape details:
- Name: example.com. is the host which nosotros are making the MX dominion for. In the information entry concealment nosotros exit the cite champaign blank for the base of operations domain. For virtually MX tape configurations the cite is left blank.
- Server: mail1.example.com. is the server that volition get got electronic mail for example.com.. Since the domain cite is appended to the cease of the server value you lot simply take away to enter mail1. If your post service server is inwards a domain that is exterior your domain thence you lot volition desire to append your FQDN amongst a point (see the side yesteryear side example).
- MX Level: 10
- TTL (time to live): The 1800 indicates how oftentimes (in seconds) that this tape volition be (will live cached) inwards other systems.
- The cease number of this tape is that electronic mail for example.com. will become to mail.example.com which is located at 192.168.1.2. So if you lot shipping electronic mail to username@example.com it volition live delivered to the electronic mail server at the IP 192.168.1.2.
Example two – Advanced MX tape configuration amongst electronic mail inwards same domain as well as dissimilar domain:
| NAME | TTL | TYPE | DATA | MX LEVEL |
| mail1.example.com. | 1800 | A | 192.168.1.2 | |
| mail2.example.com. | 1800 | A | 192.168.1.4 | |
| example.com. | 1800 | MX | mail1.example.com. | 10 |
| example.com. | 1800 | MX | mail2.example.com. | 20 |
| example.com. | 1800 | MX | mail100.backupexample.com. |
Configuration:
A record: For the Influenza A virus subtype H5N1 tape configuration explanation delight read to a greater extent than inwards the Influenza A virus subtype H5N1 – Data Entry page.
MX tape details:
- Name 1 : example.com. is the host which nosotros are making the MX dominion for. In the information entry concealment nosotros exit the cite champaign blank for the base of operations domain. For virtually MX tape configurations the cite is left blank.
- Server 1: mail1.example.com. is the server that volition get got electronic mail for example.com..
- MX Level 1: 10
- TTL (time to live) 1: The 1800 indicates how oftentimes (in seconds) that this tape volition be (will live cached) inwards other systems.
- Name two : Same equally previous MX record.
- Server 2: mail2.example.com. is the server that volition get got electronic mail for example.com..
- MX Level 2: 20 – Since this is the 2nd lowest MX degree this electronic mail server volition live tried 2nd (after the lowest MX tape which is fix at MX degree 10).
- TTL (time to live) 2: The 1800 indicates how oftentimes (in seconds) that this tape volition be (will live cached) inwards other systems.
- Name 3 : Same equally previous MX record.
- Server 3: mail1.example.com. is the server that volition get got electronic mail for example.com..
- MX Level 3: 30 – Since this is the 3rd lowest MX degree this electronic mail server volition live tried third.
- TTL (time to live) 3: The 1800 indicates how oftentimes (in seconds) that this tape volition be (will live cached) inwards other systems.
- The cease number of these records decide where the electronic mail for example.com. is delivered. At get the sending electronic mail server volition shipping electronic mail to mail1.example.com. (at IP 192.168.1.2). If that electronic mail server is unreachable it volition show to shipping electronic mail to mail2.example.com. (at 192.168.1.4). If that electronic mail server is non reachable thence the sending electronic mail server volition thence show to shipping electronic mail to the lastly electronic mail server (at degree 30) which is mail100.backupexample.com..
