Incoming mail delivery delays

Incoming mail delivery delays

Hi,

Yesterday we noticed a a delay (several hours) in delivering incoming e-mails, could you please check it out - our business is time sensitive.

Received: from XXXXXXX (XXXXXXX [209.85.213.42]) by mx.zohomail.com
    with SMTPS id 1462976251702257.9237109262955; Wed, 11 May 2016 07:17:31 -0700 (PDT)
Received: by XXXXXXXX with SMTP id o133so58658137vka.0
for <XXXXXXXXX>; Wed, 11 May 2016 07:17:31 -0700 (PDT)
Received: by 10.176.64.201 with HTTP; Wed, 11 May 2016 07:17:29 -0700 (PDT)

looks like it was received quickly, but it appeared in inbox 5h later ....