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--- doc:appunti:linux:sa:postfix [2021/11/12 10:53] – [Relay domains] niccolo
+++ doc:appunti:linux:sa:postfix [2022/05/24 09:50] – [Relay domains] niccolo
@@ Line 441: / Line 441: @@
 <file>
 smtp.example.org login_name:password
+</file>
+Se non si installa il pacchetto **libsasl2-modules** l'errore nei log è qualcosa di simile:
+<file>
+warning: SASL authentication failure: No worthy mechs found
+SASL authentication failed; cannot authenticate to server smtp.example.org[10.11.12.13]: no mechanism available
 </file>
@@ Line 719: / 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 =====