.option freeze_tell main "string list, comma separated" unset
.cindex "freezing messages" "sending a message when freezing"
+.cindex "frozen messages" "sending a message when freezing"
On encountering certain errors, or when configured to do so in a system filter,
ACL, or special router, Exim freezes a message. This means that no further
delivery attempts take place until an administrator thaws the message, or the