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-rw-r--r--docs/installing/email.md3
1 files changed, 1 insertions, 2 deletions
diff --git a/docs/installing/email.md b/docs/installing/email.md
index 8ed7331f2..8d6fc671f 100644
--- a/docs/installing/email.md
+++ b/docs/installing/email.md
@@ -34,8 +34,7 @@ Parts of this address are controlled with options in
INCOMING_EMAIL_PREFIX = 'foi+'
INCOMING_EMAIL_DOMAIN = 'example.com'
-When you have set up your MTA, if there is some error inside Rails, the
-email is returned with an exit code 75, which for postfix and exim at least means the MTA will try again later. Additionally, a stacktrace is emailed to `CONTACT_EMAIL`.
+If there is some error inside Rails while processing an email, an exit code `75` is returned to the MTA by the `script/mailin` script. Postfix and Exim (and maybe others) take this as a signal for the MTA to try again later. Additionally, a stacktrace is emailed to `CONTACT_EMAIL`.
A well-configured production Alaveteli install will have had the MTA make
a backup copy of the email sent to the special Alaveteli addresses in a separate mailbox, just in case.