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Okay, so you're saying that your mail exchange server is doing a reverse DNS check and rejecting the email because that fails, right? I recently had a problem where I was sending emails out via PHP and sendmail and the emails were going in the spambox due to reverse DNS failure as well. For me, the solution was setting a SPF (Sender Policy Framework) record ...


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Postfix and sendmail are different implementations of Mail Transfer Agents which are using Simple Mail Transfer Protocol (SMTP) for email transport over the Internet. Postfix first released in 1998 intended to be an alternative to the widely used Sendmail MTA which was used widely since 1982. Here are the summaries of all 4 popular mail agents: And ...


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The way SPF is designed requires you to add another SPF record: Domains and hosts identify the machines authorized to send e-mail on their behalf. They do this by adding additional records to their existing DNS information: every domain name or host that has an A record or MX record should have an SPF record specifying the policy if it is used either in ...


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Give the host a proper fully qualified domain name. This is one of the many problems that occur when you name a host with the naked domain name.


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I think you may want to use the Feature "mailertable" https://www.sendmail.com/sm/open_source/docs/m4/mailertables.html


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Sending mail via a smarthost is a standard exim4 configuration. This meets the criteria you specify above. Run dpkg-reconfigure exim4-config. Select the option mail sent by smarthost; no local mail. Then configure the second host as the smarthost.



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