Getting Error 5.1.2

[AshokJat]

Hi community,

One of our user is sending mail from a particular domain and they send it weekly basic but for some mail id's they are getting hard bounce notification and error code which I got in mail logs is 5.1.2.

kindly help me to understand this code that what for it is 

regards

ashok

[Ken Stieers · Accepted solution]

5.1.2 is usually an issue with domain section of the address


https://support.google.com/a/answer/3726730