5.1.0 - Unknown address error 553-'5.5.4

HCL Domino Domino Forum
1

Hi everybody,

i’ve send a mail and it’s returned with the message “5.1.0 - Unknown address error 553-'5.5.4 … Domain name required for sender address”.

Then i resend the message and go normaly.

Why the first don’t go?

Thanks.