Some domains do not accept my mails from zoho

Some domains do not accept my mails from zoho

Hi, some companies do not receive my mails from zoho.

mi domain is www.innovaaqp.com

So far, the ones that cannot receive my mails:

www.flsmidth.com
www.fmi.com
www.pacificovida.com.pe

Only this last one replied me as follows:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

alejandra.seminario@pacificovida.com.pe, ERROR_CODE :421, ERROR_CODE :4.4.0 Unable to connect to DNS - try again later

Received:from InnovaAQPlaptop1 (179.7.38.94 [179.7.38.94]) by mx.zohomail.com

                with SMTPS id 1490203134550859.1911226058305; Wed, 22 Mar 2017 10:18:54 -0700 (PDT)  Message-ID:<008501d2a330$5fe4bef0$1fae3cd0$@innovaaqp.com>

 Date:Wed, 22 Mar 2017 12:18:47 -0500

 From:"Alvaro Soto" <alvaro.soto@innovaaqp.com>  To:"'Alejandra Seminario EPV'" <Alejandra.Seminario@pacificovida.com.pe>

 Subject:RE: SCTR InnovaAQP ?

 Content-Type:multipart/mixed;

                boundary="----=_NextPart_000_0086_01D2A306.771594C0"