The old blog · Tag
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SPF DNS Lookup check for Nagios
Did you know that there is a max number of DNS lookups that can be done for an SPF lookup. The number is 10 and that includes any a or mx records along with includes to different hosts. I noticed this when I ran a SPF …
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Postfix ignore catchall relayhost
Tweet Postfix has an option where you can setup a relayhost to send all mail to another mail server. It looks something like relayhost = [mail.domain.com]:25 So that will send all mail being sent out from the server to …