Yes, you ave a mailer loop. mx1 Receive 7B34152BBDB (2326 bytes) from macbook mx1 Deliver 7B34152BBDB to content filter, receive as B8C5452BBDF (4004 bytes). mx1 Deliver B8C5452BBDF to cmx01 as 4L4tdt0Fk8z2SSLv
cmx01 Receive 4L4tdt0Fk8z2SSLv (4998 bytes) from localhost which was sent to 8.10.12.14. cmx01 Deliver 4L4tdt0Fk8z2SSLv to NON-POSTFIX SMTP SERVER with UNKNOWN QUEUE ID. There is no logging how the non-postfix smtp server received the message. There is no logging how the non-postfix mta forwarded the message to mx1. mx1 receive 7C32952BBDB (4155 bytes) from cmx01 (NOTE MESSAGE HAS SHRUNK) mx1 deliver 7C32952BBDB to content filter, receive as 5918E52BBDF (5537 bytes) mx1 Deliver 5918E52BBDF to cmx01 as 4L4tdy3tg5z2SSLv cm01 receive 4L4tdy3tg5z2SSLv (6531 bytes) from localhost which was sent to 8.10.12.14 cmx01 Deliver 4L4tdy3tg5z2SSLv to NON-POSTFIX SMTP SERVER with UNKNOWN QUEUE ID. And so on. Where should the message be stored? Then THAT MTA should be configured to store email for the recipient. If the problem is with the non-Postfix Postfix MTA, then I can't make specific recommendations, other that "don't do what you're doing now." If the problem is with one of the Postfix MTAs, then look at https://www.postfix.org/ADDRESS_CLASS_README.html#classes and configure the recipient's domain in the appropriate address class (local domain class, virtual alias domain class, or virtual mailbox domain class). Wietse