How can I configure to treat an SMTP error 550 (Relaying denied) on outbound mail as a temporary failure so the message can be retried later?
My ISP uses "POP before SMTP" authentication and I make sure the POP3 box is checked before allowing Exim to send any mail but SOMETIMES the authentication seems to fail and I get VERY sporadic "550 Relaying denied" errors (one or two every few weeks). I've complained to the ISP about this problem but they haven't been able to fix it (even occurs using Windows Outlook Express!).
Because correctly processes these as permanent errors, my users get delivery failure notifications and I must try to explain the problem and
then ask them to re-send the messages (pretty embarassing!).
Is there any way to have an SMTP error 550 as if it were a
temporary error?
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