service/email.md

@@ -70,6 +70,21 @@ Then on first email send you will be prompted for your email
 password. You should *NOT* get a certificate warning, a real cert
 (signed by Let's Encrypt) should be presented by the server.
 
+### Use torproject.org identity when replying
+
+In most cases Thunderbird will select the correct identity when replying to
+messages that are addressed to your "@torproject.org" address. But in some
+other cases such as the Tor Project mailing lists, where the recipient address
+is not yours but the mailing list, replying to a list message may cause a
+warning to appear in the bottom of the compose window: "A unique identity
+matching the From address was not found. The message will be sent using the
+current From field and settings from identity username@torproject.org."
+
+This problem can be fixed by going into "Account settings", "Manage
+identities", clicking "Edit..." after selecting the `torproject.org` identity.
+In the dialog shown, check the box next to "Reply from this identity when
+delivery headers match" and in the input field, enter "torproject.org".
+
 ## Apple Mail configuration
 
 These instructions are known to be good for OSX 14 (Sonoma). Earlier versions