Use Mail Services by GoDaddy on Linode "@ invalid character"

Hello everyone,

I am quite new to hosting a website so my problem might be super trivial.

I acquired the email service from GoDaddy, from which I also bought the domain that my linode is using. I am at the step of verifying that I own the domain (now that linode is using its dns) and I am asked to set a TXT record as follow:

Record TXT —
Name Value TXT
@ MS=msXXXXXXXX

On the Domains section on cloud.linode.com, I found the mentioned TXT record for which I have to specify a hostname and a value. Assuming that Name -> hostname, I inserted '@' as hostname but I get the 'Name contains invalid characters' error. I tried a number of other combinations but nothing has worked yet. How should I proceed?