Need soft bounce reason interpreted

[Casler_Nancy__N]

I am seeing the following detail on my leads' activity reports on the soft bounce event. Does anyone know what that means exactly? I don't see anything wrong with the format of the from address...

"System send failure: DKIM signing error (Unexpected From address format in injectMessage '1 <1>')"

Thank you!

[Grant_Booth]

Hi Nancy,

If you edit a draft of the email in Marketo, could you double-check that the From address is a valid address?

Grant

[Anonymous]

The from address is probably invalid or blank in that email

[Alok_Ramsisaria]

Are you using a token in From email, without any default email ID? If yes, please add a default email ID to fix this.