On 23 May 2011, at 13:13, Graham Butler wrote: > I am currently looking into adding 'require verify = sender', with no > callouts, to our Exim configuration. Unfortunately, my manager went to a > conference last week and was informed that adding 'verify sender' was not > very wise and could lead to the rejection of legitimate emails. > > From my understanding,' verify sender' is 'confined to verifying that the > domain is registered in the DNS' with either a MX or an 'A' address. > Rejecting such emails I would have thought would be good practice. I would > agree that using 'verify sender' with callout is bad practice. > > Is the use of 'verify sender' recommended, and can anybody who has included > 'verify sender' give any feed back on any problems they have experienced > regarding rejections of legitimate emails.
I quite often investigate problems with sender verification callouts (a few times a month, perhaps). Only very occasionally are they due to an undeliverable domain. An undeliverable email address in a return path is invalid, for whatever reason. > Graham Butler > Infrastructure Team. > The University of Huddersfield -- Ian Eiloart Postmaster, University of Sussex +44 (0) 1273 87-3148 -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
