[exim] Retry on "No route to host" error

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Author: Patrick J Cherry
Date:  
To: exim-users
Subject: [exim] Retry on "No route to host" error
Morning all,

I had a complaint from a customer of a bounce from our backup MX this
morning following a apparently transient routing burp. I was wondering
if anyone knew a way to catch "No route to host" errors and having exim
apply its normal retry rules on that message.

The log entries looked like:

2009-09-04 07:19:30 1MjT50-0005G2-Ng <= local_part@yahoo H=(web23704.mail.ird.yahoo) [87.248.115.62] P=smtp S=2236 id=608571.55792.qm@???
2009-09-04 07:19:33 1MjT50-0005G2-Ng a.mx.customer.domain [89.16.x.x] No route to host
2009-09-04 07:19:34 1MjT50-0005G2-Ng == web@??? R=dnslookup T=remote_smtp defer (113): No route to host
2009-09-04 07:19:34 1MjT50-0005G2-Ng ** web@???: retry timeout exceeded
2009-09-04 07:19:34 1MjT50-0005G2-Ng Completed

Having had a look at the docs, it appears that such an error isn't
listed amongst the specific errors for retry rules.

At the moment our rule looks like

# Domain               Error       Retries
# ------               -----       -------


*                      *           F,1d,15m; F,1w,2h


and we're running Exim 4.63.

Thanks!

-- 
Patrick J Cherry                               Bytemark Hosting Support
                                             http://www.bytemark.co.uk/
                                              tel: +44 (0) 1904 890 890