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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 ...


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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