[LeonM]

This is typically not a big deal, as explained in the message, it is a temporary countermeasure. It'll resolve itself as long as you really aren't spamming.

Though Gmail responds citing your IP, Gmail and all other large email services don't use IP filtering. Just about all email service providers use domain reputation, since IPs are ephemeral.

If you are sending transactional emails that your customers have agreed to, then your domain (!= ip) rating will improve over time and there will be less countermeasures, regardless of which IP you use to send.

> Is anyone facing the same issue with AWS? or similar issues with other bulk email service providers?

This is just Gmail doing it's thing (the right thing, in my opinion, contrary to most HN sentiment). It is independent of which sender you use.

> How do you deal with such issues in the future? Set up alternative email service providers.

Use DMARC reporting to verify that all your email is sent with DKIM alignment, to make sure that you aren't causing the problem. This is independent of email service provider.

But as explained, you are being rate limited, not blocked. Email will be delivered, it'll just take longer. You state that you have a 60-90 day margin for delivery, so I wouldn't worry about it too much.

> Is this the side effect of Gmail's dormant account deletion rolled out last week?

No.

[leetrout]

Not entirely true. There is a reason Mailchimp owns a rather large block of IP addresses.

https://ipinfo.io/AS14782

[LeonM]

> Not entirely true

OK you are right, Gmail may use IP-based rating, but it only does that if there isn't sufficient proof (in form of DKIM signatures) that the email is sent on behalf of the domain. If the email is DKIM aligned, then domain rating is used. I just didn't want to go that far into detail in my post.

> There is a reason Mailchimp owns a rather large block of IP addresses.

The reason is mostly for supporting smaller/legacy/self-hosted email services that do rely on IP reputation. Since Mailchimp won't allow customers to bulk email unless they have DKIM set up correctly, they don't have to worry as much about IP spreading with the major email service providers.

[jeffbee]

I don't think this is accurate. Address reputation is an important signal regardless of DKIM.