I’ve looked all over the internet and can’t find an answer to this, so I’m hoping someone can help me! I’m running Postfix 2.3.3 on CentOS and I’m using virtual domains which are stored in a MySQL database. Basically some of the domains have a catch-all account for example email@example.com. However when an email is sent to firstname.lastname@example.org the Delivered-To header seems to get rewritten by Postfix and becomes email@example.com. This is fine as the mail is delivered to the catchall mailbox. My problem comes however when our end user downloads the mail from the firstname.lastname@example.org account using MS Exchange as it tries to deliver mail to email@example.com on the local domain instead of firstname.lastname@example.org and that user doesn’t exist so the mail gets bounced back. This also happens if the transport mappings are set to forward all mail via SMTP directly to the end users exchange server. Is there any why I can get round this, or can I configure postfix so that it delivers the mail to the catchall mailbox without changing the Delivered-To header?