When users add CNAME records on a GoDaddy hosted website, they are getting tagged with your domain twice.
For example, if you post a record like this:
em1234.domain.com
It gets posted like this:
em1234.domain.com.domain.com
To resolve this issue, please remove all SendGrid posted records from your side. Once these records are removed, please re-add them using the following formatting:
CNAME | em1234 | u1234567.wl123.sendgrid.net |
CNAME | s1._domainkey | s1.domainkey.u1234567.wl123.sendgrid.net |
CNAME | s2._domainkey | s2.domainkey.u1234567.wl123.sendgrid.net |
Notice: If you have multiple Domain Authentication entries, please make sure to remove all the ones that are not valid.