This article covers the basic configuration of SPF, the purpose of which is covered in the Email Spoofing Overview, please read that article before proceeding with the below. (More advanced configurations are possible)
When configuring SPF our clients should seek guidance from their IT provider to ensure any changes that are made are fit for purpose and will not negatively impact their e-mail or other services.
Clients should ensure they backup or otherwise record any values they change so that they are able to revert those changes if necessary.
Using the following information create, or update, your SPF record in your Server (for example GoDaddy) with the following host names: -
- guestline.net
Legacy Entries
In the past we've asked our clients to include entries that are no longer required and can be safely removed these include: -
- 149.72.1.66
- 20.184.12.41
- 52.166.124.85
- rezlynx.net
- sendgrid.net
- roomlynx.net
New SPF record example
Where there is no existing SPF record simply create the following entry: -
|
Host |
Type |
Data |
|
myhotel.com |
TXT |
v=spf1 include:guestline.net -all |
Merge with existing SPF record example
However, where there is already an SPF record, entries would need to be merged.
So where a property already has: -
|
Host |
Type |
Data |
|
myhotel.com |
TXT |
v=spf1 a include:partner.myhotel.com -all |
This should be updated to: -
|
Host |
Type |
Data |
|
myhotel.com |
TXT |
v=spf1 a include:partner.myhotel.com include:guestline.net -all |
Removal of legacy SPF record entries example
Too many SPF record entries can cause problems and as such legacy entries should be removed.
So where a property has: -
|
Host |
Type |
Data |
|
myhotel.com |
TXT |
v=spf1 a include:partner.myhotel.com ipv4:149.72.1.66 include:20.184.12.41 include:52.166.124.85 include:guestline.net include:rezlynx.net include:sendgrid.net -all |
We can safely remove include:sendgrid.net include:rezlynx.net include:roomlynx.net include:sendgrid.net ip4:149.72.1.66 leaving: -
|
Host |
Type |
Data |
|
myhotel.com |
TXT |
v=spf1 a include:partner.myhotel.com include:guestline.net -all |
Check if a domain has SPF records correctly set
Go to https://mxtoolbox.com this is a public site used to check DNS
Specifically you will want the SPF Record Lookup, which you can find on this area of the site - https://mxtoolbox.com/SuperTool.aspx?action=spf
Ensure the text box is blank, then type in the email domain name of the client (i.e guestline.com, microsoft.com, hotelx.com, hotely.com etc)
Then click the button:
You can see these results yourself by going to https://mxtoolbox.com/SuperTool.aspx?action=mx%3ayour-hotel-here.com&run=toolpage
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