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Thread: Global MTA settings

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  1. #1
    Join Date
    Jul 2006
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    Question Global MTA settings

    Hi All,
    i have enabled the following Global MTA settings:

    Enable authentication
    TLS authentication only
    Protocol checks:
    Hostname in greeting violates RFC (reject_invalid_hostname)
    Client must greet with a fully qualified hostname (reject_non_fqdn_hostname)
    Sender address must be fully qualified (reject_non_fqdn_sender)
    DNS checks:
    Client's IP address (reject_unknown_client)
    Hostname in greeting (reject_unknown_hostname)
    Sender's domain (reject_unknown_sender_domain)

    If a messages is rejected by these is the sender informed & is there a log


  2. #2
    Join Date
    Mar 2006
    Rep Power


    Well, I'm not a Postfix expert, but I'll take a shot at giving you an answer since no one else has yet.

    On your side these rejections should appear in the maillog file, which I believe resides in /var/log on most systems. Run a 'grep reject maillog' and you should see the rejections. Note that the rejection messages don't exactly match the settings here. For example, reject_unknown_sender_domain will show up in the log as something like "Sender address rejected: Domain not found". I believe you can change these messages within the Postfix configuration.

    As far as whether or not the sender is notified I would answer "it depends". With these settings Postfix is going to drop the connection with the sending email server. In many cases the sending email server will bounce a message back to the original sender from the Mail Delivery Subsystem; at least this is the case with Sendmail and Postfix.

    As I said, I'm not a Postfix expert so hopefully I haven't led you astray here, and if I have hopefully someone else will jump in and correct me.

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