Postfix smtp relay without authentication Users can also use STARTTLS over port 25. That means anything you send to [email protected] gets locally delivered, not via the smarthost. colm in your “mydestination” configuration. Topics covered in this document: When using Postfix and IMAP on a mailserver, at least 3 ports are usually opened. In order to relay the email to another SMTP server without always relaying by default make use of sender_dependent_relayhost_maps in configuration file (/etc/postfix/main. . Update “mydestination” accordingly. You mean, ISPs provide open relays for their clients that could be freely used without authentication? That is the case at least in Finland. Within your Postfix configuration, you can use the setting smtpd_recipient_restrictions in order to decide who should be able do use your server as a relay. I would like to disable that. mydomain. recipients, permit_sasl_authenticated, reject_unauth_destination. My plan is to use port 25 for the public sending me email. It can use a text file or MySQL table as a special password database. In this scenario, the Postfix mail server is configured to relay emails from one source to another without needing clients to authenticate with a username and password. By default this is not so. The Postfix SMTP server receives mail from the network and is exposed to the big bad world of junk email and viruses. If you are looking for a guide to help you configure Postfix as an SMTP relay without authentication, our experts have your back. Use your service provider's SMTP service for mail relay. Set permissions: Where, Get Google to add your server IP as a trusted sender (not likely to happen). It will only send emails to relayhost when it pertains to domains it cannot use locally. If you are looking for a guide to help you configure Postfix as an SMTP relay without authentication, our experts have your back. cf). postfix will not require authentication to receive mails for the domains it handle under mydestination, relay_domains virtual_alias_domains and virtual_mailbox_domains. com and emc-mv-vapp05. I would like to configure postfix, so that authorized users can only send email through 465. Save and close the file. This document introduces the built-in and external methods that control what SMTP mail Postfix will accept, what mistakes to avoid, and how to test your configuration. Thanks for the telnet and postfix logs. This can be done by adding a check of the recipient to your smtpd_recipient_restrictions so it would look something like the following in main. In your case you have mydomain. If you're using relayhost, don't. How do I relay mail through my mail ISP servers using Postfix SMTP under Linux / UNIX like operating systems? Postfix has a method of authentication using SASL. For example, in my config it looks like this: permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination. cf: permit_mynetworks, check_recipient_access hash:/etc/postfix/access. ibv nbbjqv tgayne lyoz mfldcwo totit wszame aidlpp gxiejm dvt