I checked mail delivery from 3 servers to google. All mail is from hi@kaustav.me
gmail with outbound server set as zoho delivered in 0 seconds. gmail to gmail with from set to zoho
Message ID <CABaOn_z82JMJsDX62fTQ0vG76HPVTn60iVEDxD1GCzEQVy0foA@mail.gmail.com>
Created at: Mon, Nov 4, 2019 at 12:17 PM (Delivered after 0 seconds)
From: Kaustav Haldar <hi@kaustav.me>
To: Kaustav haldar <kausthal@gmail.com>
Subject: SE opportunities[HN Who's Hiring 11/2019]
Directly from zoho to gmail:
Message ID <16e376eb1a9.117baa727217582.222190604686344840@kaustav.me>
Created at: Mon, Nov 4, 2019 at 12:20 PM (Delivered after 38 seconds)
From: kaustav <hi@kaustav.me> Using Zoho Mail
To: kausthal <kausthal@gmail.com>
Subject: SE opportunities[HN Who's Hiring 11/2019]
DKIM: 'PASS' with domain kaustav.me Learn more
Via apple mail configured to use zoho for outgoing smtp server:
Message ID <7A73B71A-7649-4FF9-BAD7-44C5E7712E2C@kaustav.me>
Created at: Mon, Nov 4, 2019 at 12:19 PM (Delivered after 267 seconds)
From: kaustav haldar <hi@kaustav.me> Using Apple Mail (2.3594.4.19)
To: kausthal@gmail.com
Subject: SE opportunities[HN Who's Hiring 11/2019]
DKIM: 'PASS' with domain kaustav.me Learn more
Guesses:
- Google heavily optimizes for mails within it's infrastructure. Lack of DKIM and SPF is worrying but speed is impressive and it seems to circumvent the classical internet infra.
- Zoho on site is a direct zoho server to google push. The mail still needs to be validated by googles servers.
- Via apple mail we incur network and verification latency twice but 267 is really really bad but at least we still retain valid dkim and spf records