Viktor Dukhovni:
> On Fri, Mar 11, 2016 at 08:57:48AM -0700, @lbutlr wrote:
>
> > I have MX monitoring that says I am not on any blacklists and that the
> > server is secure
> >
> > # dig @8.8.8.8 covisp.net any
>
> My first SMTP connection attempt to your server resulted in:
>
> $ posttls-finger covisp.net
> posttls-finger: Connected to mail.covisp.net[65.121.55.42]:25
> posttls-finger: < 220-mail.covisp.net ESTMP -- Please wait
> <brief delay>
> posttls-finger: < 220 mail.covisp.net ESMTP Postfix 3.0.3
> ...
postscreen?
Wietse
> Subsequent connections yield:
>
> $ posttls-finger covisp.net
> posttls-finger: Connected to mail.covisp.net[65.121.55.42]:25
> posttls-finger: < 220 mail.covisp.net ESMTP Postfix 3.0.3
> ...
>
> You have some sort of proxy in front of your Postfix server. The
> proxy may be blocking Yahoo's servers.
>
> --
> Viktor.
>
