Postfix sasl relay host

postfixsaslsaslauthdsmtpsmtp-auth

I'm trying to set up SASL to a relayhost to send external email. I've read a hell of a lot and done everything I'm supposed to have done. However our provider won't accept me relaying emails with (we are not on their network, but they say this is ok as long as we auth with SASL):

host mailhost.zen.co.uk[212.23.3.98] said:
550-This is not an open relay. To send through this server you must either
be 550 on a Zen Internet IP address or be authenticated over TLS. (in reply
to MAIL FROM command)

We agree that I'm not sending the username and password other wise it would either send, or say my username password is incorrect.

The question is, why isn't postfix sending it:

Heres the parts of my main.conf that I think are relevent:

    smtpd_helo_restrictions = permit_mynetworks, warn_if_reject reject_non_fqdn_hostname, reject_invalid_hostname, permit

    smtpd_client_restrictions = reject_rbl_client sbl.spamhaus.org, reject_rbl_client blackholes.easynet.nl, reject_rbl_client dnsbl.njabl.org

    smtpd_recipient_restrictions = reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unauth_destination, check_policy_service inet:127.0.0.1:60000, permit

    smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_unauth_pipelining, permit

    relayhost = mailhost.zen.co.uk
    smtpd_sasl_auth_enable = yes
    smtpd_sasl_password_maps = hash:/etc/postfix/sasl_passwd
    smtpd_sasl_type = cyrus
    smtpd_sasl_authenticated_header = no
    broken_sasl_auth_clients = yes
    smtpd_sasl_security_options = noanonymous
    smtpd_sasl_local_domain =

of couse I've set the password in sasl_passwd and postmapped it.
Here's some of the resources I've been using are:

Would be great is anyone has any other suggestions 🙂

Best Answer

If you want the SMTP connection from your MTA to mailhost.zen.co.uk to be SASL auth'd, you want the smtp_sasl_* parameters, not the smtpd_sasl_* parameters. The latter is for when you're the receiving MTA, while the former are for when you're connecting to another MTA, as you appear to want to do here.

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