[exim] Send mail via fallback interface

[Patrik Peng via Exim-users]

Hi




The following configuration achieves the desired result.


remote_smtp:
  driver = smtp
  interface = ${if <{300}{${eval:$tod_epoch - $received_time}}{<; $FALLBACK_IPV4; 
$FALLBACK_IPV6}{<; $DEFAULT_IPV4; $DEFAULT_IPV6}}



Transport: mx1.host.net [123.123.123.123/NULL] error 60: Operation timed out
  first failed: 07-Mar-2024 12:01:28
  last tried:   07-Mar-2024 17:13:06
  next try at:  07-Mar-2024 18:43:06
Transport: mx2.host.net [123.123.123.124/NULL] error 60: Operation timed out
  first failed: 07-Mar-2024 12:01:06
  last tried:   07-Mar-2024 15:45:22
  next try at:  07-Mar-2024 17:15:22





Kind regards,
Patrik

For situations where an IP is blocked or rate limited, we would like to automatically try to send the mail via an alternate interface. If a mail is queued for more than 5 minutes, it will be sent from a different source IP. While the mail can be sent on a second try, the retry database does not reflect this: After a while (past the final cutoff time), this causes mails to these hosts to be bounced immediately (as documented). Is there another way to retry sending mails from a different source interface while maintaining correct retry db entries?

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