Email delays when testing the customer account login process on my store (Version 2) in Gmail

Technical Q&A
1

I’m experiencing email delays when testing the customer account login process on my store (Version 2). Specifically, emails containing verification codes sent to Gmail are delayed.

I’ve noticed that the emails show: mailer3pk.[mydomain].com

I suspect that this mailer3pk subdomain may be contributing to the delays.

Is there a way to prevent emails from being sent via the mailer3pk subdomain and have them appear as sent directly from my domain (i.e., [mydomain].com) instead?

I would like to set up a custom SMTP configuration for sending emails through my domain to improve delivery speed, but I understand that Shopify currently does not offer SMTP setup in the admin. Is there any workaround or alternative solution to achieve this?

2

Google enforces strict authentication records. So there’s a process for that. Did you authenticate the domain in Settings → Notifications → Sender authentication and add the required CNAME records to your DNS provider? If you haven’t set all that up, you should probably check that out.

3

I already set CNAME and other DNS config.
I got message “Domain successfully authenticated” in shopify Sender authentication section.
I can received email in inbox, but it is delayed for a reason it Gmail.