Maciej Uhlig:
> We found the following in postfix log while expecting test mail delivery:
>
> 2012-03-29T13:32:41+02:00 services/192.168.10.210
> postfix/postscreen[1697]: [ID 197553 mail.info] NOQUEUE: reject: RCPT
> from [74.125.83.53]:56421: 450 4.3.2 Service currently unavailable;
> from=<sender@theirdomain <mailto:uh...@gazeta.pl>>,
> to=<recipient@ourdomain <mailto:ni...@instytutsztuki.us.edu.pl>>,
> proto=ESMTP, helo=<mail-ee0-f53.google.com>
>
> 2012-03-29T13:40:33+02:00 services/192.168.10.210
> postfix/postscreen[1697]: [ID 197553 mail.info] NOQUEUE: reject: RCPT
> from [74.125.82.43]:35504: 450 4.3.2 Service currently unavailable;
> from=<<mailto:uh...@gazeta.pl>sender@theirdomain
> <mailto:uh...@gazeta.pl>>,
> to=<<mailto:ni...@instytutsztuki.us.edu.pl>recipient@ourdomain
> <mailto:ni...@instytutsztuki.us.edu.pl>>, proto=ESMTP,
> helo=<mail-wg0-f43.google.com>
>
> So, google.com got 450 from postscreen and repeated delivery from
> _other_ IP and then got another 450. It's possible the mail would not be
> delivered at all if google.com had sent it from different 60 thousands
> :-) IP addresses every time.
The "after 220 greeting" tests re turned off by default.
Don't turn on the "after 220 greeting" tests if you don't
want to live with the consequences of doing so.
Wietse
