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I have installed and configured postfix on our server.

Postfix config file has relay_domain parameter which contains the list of domain names which postfix will support.

Is there a way by which we can support all domain names in postfix without creating relay_domain database list?Edit

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  • That will be creating an Open relay
    – topdog
    Dec 6, 2010 at 12:18
  • How can we create open relay ? Please give details ..
    – Champion
    Dec 6, 2010 at 12:43
  • with postfix you can't. try sendmail, some older version :)
    – user237419
    Dec 6, 2010 at 13:34
  • We have saas model service hireplug.com for companies social recruitment. We send a lot of emails to them using postfix smtp server. Now every time a recruiter belonging to a company joins , his company domain name has to be added to postfix relay-domain list which is kind of painful . Cron job is one solution which will modify relay-domain list. Is there a better solution, postfix provides out of the box?
    – Champion
    Dec 6, 2010 at 14:13

1 Answer 1

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explicitly specifying the domains you want to relay mail for is a security measure against spam and other types of misuse of smtp systems.

if you are only interested in automatically enabling relaying for subdomains, you can set parent_domain_matches_subdomains variable.

postfix doesn't support blind relaying ... at least to some extent. in some scenarios, you may use permit_mx_backup to relay for domains that your mail server is listed as a backup (secondary, higher dns mx rr priority) mx. but do carefully read permit_mx_backup specification and related documents like permit_mx_backup_networks. but this is very dangerous and I already see ways of exploiting it via dns. don't doit.

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  • We have saas model service hireplug.com for companies social recruitment. We send a lot of emails to them using postfix smtp server. Now every time a recruiter belonging to a company joins , his company domain name has to be added to postfix relay-domain list which is kind of painful . Cron job is one solution which will modify relay-domain list. Is there a better solution, postfix provides out of the box?
    – Champion
    Dec 6, 2010 at 14:10
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    you don't need to add a domain to relay_domains table to be able to send emails to users from that domain. to do that, configure smtpd_recipient_restrictions to trust email from authed users and trusted networks. for example: smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_non_fqdn_recipient, reject_non_fqdn_sender
    – user237419
    Dec 6, 2010 at 14:39
  • ... and configure your $my_networks parameter and sasl authentication mechanisms (if needed)
    – user237419
    Dec 6, 2010 at 14:41
  • Configurations main.cf file. myhostname = srv_name alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = hireplug.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_non_fqdn_recipient, reject_non_fqdn_sender relayhost = mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all home_mailbox = Maildir/ mailbox_command =
    – Champion
    Dec 7, 2010 at 6:14
  • It's sending mail from postfix server using telnet but not forwarding mail when using a email client . Anything missing ? A quick reply will be appreciated ?
    – Champion
    Dec 7, 2010 at 6:17

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