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I'm setting up postfix to forward e-mails sent to a domain to outside e-mail addresses. i.e. when I get an e-mail at [email protected] it gets sent automatically to [email protected]. That's working except that when I receive the e-mail it shows the recipient at [email protected] instead of [email protected].

I know it's possible to do this because when I had e-mails forwarded using some web panel on a cheapo hosting company, it worked great. So how do I get postfix to retain the recipient address even though it's being forwarded to another address?

My config:

alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no config_directory = /etc/postfix home_mailbox = Maildir/ inet_interfaces = all inet_protocols = all mailbox_command = mailbox_size_limit = 0 mydestination = mydomain.com, localhost.localdomain, localhost myhostname = mx1.mydomain.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname readme_directory = no recipient_canonical_maps = hash:/etc/postfix/recipient_canonical recipient_delimiter = + relayhost = [smtp.mandrillapp.com] smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes

To be clear, when I receive the e-mail at the forwarded address, I still want it to show the To: address as having the original recipient (@mydomain.com).

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  • Two questions: [1] What's your current configuration? (please edit the question and post the output of postconf -n command) [2] Which address that do you want to keep? MAIL TO: envelope recipient or To: headers in the message itself? Commented Jun 2, 2015 at 11:38

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Looks like you use this parameter

recipient_canonical_maps = hash:/etc/postfix/recipient_canonical

to provide mail forwarding. By default Canonical address mapping will rewrite both header and envelope address. So, disable header rewriting, you have two options here

  1. Configure recipient_canonical_classes so recipient_canonical_maps affects envelope address only.

    recipient_canonical_classes = envelope_recipient

  2. Use virtual_alias_maps that designed for envelope address mapping without touching header.

The virtual_alias_maps option is preferred in this case as you can use it to perform one-to-many mapping. Parameter recipient_canonical_maps only support one-to-one mapping.

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  • Let me explain what I did. First, I started with virtual_alias_maps, but then I saw repeated warning not to use that with the same domain as my primary domain. In any case, it had the same problem. Next I moved everything to the standard alias_maps and it didn't change anything. Next I tried adding the recipient_canonical_maps, but that didn't change anything either. I meant to remove the recipient_canonical_maps listing in any case, and I certainly need one-to-many mapping. So is there a way to retain the recipient address using the standard alias_maps? Commented Jun 2, 2015 at 15:44
  • Ah, looks like the appropriate config is alias_maps, not virtual_alias_maps. Remember that alias_maps syntax is bit different with both virtual_alias_maps and recipient_canonical_maps. Anyway can you share alias_maps file entry and the exact error message in mail.log? Commented Jun 2, 2015 at 21:45

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