[Dovecot] Fwd: sender address of sieve vacation script

[Wolfgang Burger POP]

Dear Odhiambo,

> The <> represents the "null sender" in SMTP parlance. I think the  
> issue here is that the destination SMTP server does NOT accept the  
> null sender (<>), and that is a br0ken configuration. It has nothing  
> to do with Dovecot though. I am not good at interpreting postfix  
> logs so I cannot advise further.


100% correct answer.
I checked with the admin of the relay and it´s working now.
Thank you very much

Best regards,
Wolfgang Burger