Differences

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--- doc:appunti:linux:sa:postfix [2022/01/20 10:06] – [Smarthost (relayhost)] niccolo
+++ doc:appunti:linux:sa:postfix [2022/05/24 09:50] – [Relay domains] niccolo
@@ Line 697: / Line 697: @@
 </file>
-===== Relay domains =====
+===== Relay by recipient domain =====
 To relay mail for non-local domains (domains not in ''mydestination'' and not in local virtual domains), use the **''relay_domains''** setting:
@@ Line 726: / Line 726: @@
 user@local.domain  smtp:remote.realay.host
 </file>
+===== Relay by sender =====
+It is possibile to select a different relay path for messages based on sender address. Add the directive **sender_dependent_relayhost_maps** to **main.cf**:
+<code>
+sender_dependent_relayhost_maps = hash:/etc/postfix/sender_dependent_relayhost_maps
+</code>
+Each line of the file must contain a regular expression matching the sender address and the name or address of the relay host:
+<file>
+username@rigacci.org     relay2.rigacci.org
+*@domain2.org            relay3.rigacci.org
+</file>
+Remember to recompile the file whenever you change it using **postmap** (no need to reload Postfix).
+All the standard requirements for a relay host are necessary. The relay host must be listed into the SPF record of the mail domain and the relay host should accept the original sender (e.g. via the **mynetworks** Postfix directive).
 ===== HELO hostname =====