Hi Exim Users! There were two problems. First the defer_ok Flag should be used twice as Lena mentioned.
verify = recipient/defer_ok/callout=10s,defer_ok,use_sender Second the callout timeout was 2m and therefore to long for the SMTP-Clients which run into SMTP/TCP-timeout before completing the Callout. Additionally the target system has (maybe intentional) one dysfunctional (time at each connect) mailserver prioritized above the others. Maybe this is to scare away SPAMMERS. Nevertheless it contributes to the problem negatively. IMHO all such dirty hacks to prevent SPAM makes it really hard for other admins to have their mailsystems run smoothly and should be avoided. We run two large Email-Servers and never had the need for such tricks. Our SPAM suppression rates are fairly high 99% of incoming E-Mail is filtered out. And the rate of false positives is one Email per month and our customers can deal with that utilizing their individual whitelists on customer and domain and email address level. Many thanks to all here contributing to the solution of this nasty problem. Cheers Volker -- ========================================================= inqbus Scientific Computing Dr. Volker Jaenisch Richard-Strauss-Straße 1 +49(08861) 690 474 0 86956 Schongau-West http://www.inqbus.de ========================================================= -- ## 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/
