What are you trying to achieve? There are alot of scenarios where Postfix may be used: * "Send only" email server for your website (to give your website ability to send emails). You never receive any emails from the outside. * Forward only: it just accepts mails from your apps, and sends them via smart host (SMTP server of your provider). Some people run it on their laptops) * Email hosting: users send and receive emails with your Postfix (as they do with Gmail, for example) etc
It is important to choose a scenario, because if you only need to send emails from your website, then you do not need dovecot nor MX record and you even do not need to listen for incoming connections to the public port, but you may need DKIM and SPF. In the "forward only via smart host" scenario you need almost nothing: no MX, no SPF/DKIM, no public port. If you want to receive emails, then having an MX record is a good idea. You would also need to listen public port for incoming connections, and may be one more port for clients (465 or 587) On Tue, Oct 13, 2020 at 5:19 PM Jason Long <hack3r...@yahoo.com> wrote: > Thank you for all of your messages. > With that tutorial, which record or port is needed? > > > > > > > On Tuesday, October 13, 2020, 04:31:34 PM GMT+3:30, Wietse Venema < > wie...@porcupine.org> wrote: > > > > > > Jason Long: > > > Hello, > > Can I use Postfix without MX record? I installed Postfix and?Dovecot > > via "https://wiki.centos.org/HowTos/postfix"; tutorial and I want > > to know can I use it without MX record? > > > The SMTP standard (RFC 2821) does not *require* MX records. Some > uninformed mail operators may require one, but those are rare. > > Wietse > >
