Hello All, We run a postfix smtp relay that customers use. Customers have reported that they can not send out of offies replies from their Exchange Server.
Further investigation shows that this is caused by Microsoft changing the way Exchange 2010 delivers out of office replies whereby it replaces the sender with a null sender address to conform to RFC 2298. See here: http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/automatic-email-server-notifications-in-exchange-server-2010.html Our postfix smtp relay is only set to allow users to relay through it if the Source IP address and sender domain contained inside the access-sender file is configured resulting in out of office replies with a null sender address being denied. \\ snippet of postfix config mynetworks = 127.0.0.0/8, 10.x.x.0/19 smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/access-sender reject My questions is - Is there a way to get postfix to allow Outlook out of office replies with the null sender address to relay through it without adding ALL DOMAINS to the access-sender file(thus making it an open relay)? I've googled around but haven't really found an answer to this question. Not sure if the only way to allow this is to set up some form of SASL authentication between the customer's Exchange Server and our smtp relay. We are running postfix 2.3.3 # postconf -d | grep mail_version mail_version = 2.3.3 milter_macro_v = $mail_name $mail_version Thank you in advance.
