On 2024-04-30 04:44, Mendel Kucharzeck via mailop wrote:
Laura,

Thanks for your reply! Highly appreciated. Inline:

- Anyone else seeing this behaviour from gmail recently?
- Could the newly created, custom MAIL-FROM-domain cause a behaviour like this? 
The MAIL-FROM-Domain has not yet been used before, but the sending email 
address was the same

You changed a domain that is important in authentication. That changed the 
identity of the message. That meant you were treated as a semi-new sender by 
the machine learning filters.

I was aware that different IPs, domains or email addresses require prior warmup 
– but I was not aware that the return-path/MAIL-FROM-domain also requires a 
warmup. Interesting.

Personally, never heard of that.. Normally a correct MAIL FROM is a positive indicator. Of course, the word on the street is that that unknown domains (unknown to Gmail) may have stricter indicators, especially if marked by a Gmail user as spam..

But usually, as long as there is a proper SPF record, it isn't an issue. I would 'suggest' that it might be a combination of things.




Any insights or hints on how to investigate this would be highly appreciated.

You may need to back off and go through a short warmup phase to introduce that 
this SPF + this DKIM + this Header From from SES shared pool is a valid source 
of mail.

Will do this over the coming weeks. I’ll spread out my next campaign from one 
hour to 5-15 days.

ALSO - did you actually have any delivery problems? One thing I’ve noticed (at 
Gmail in particular) is that changes in an authenticated domain often result in 
a lower rate of pre-fetching of images *without* any corresponding change in 
delivery.

Yes. All other metrics (hits on homepage, sales, customer responses, 
unsubscribes) were WAY lower than anticipated compared to previous campaigns. 
It’s not a measurement thing that’s off.

Before you start freaking out about things, check to see if your delivery is 
different. Pixel loads are fickle beasts and it’s worthwhile to understand if 
this is a change in display behavior (ie, it’s a new sender of email, so Google 
isn’t going to prefetch mail until it knows if this is a valid and wanted mail 
stream or if it’s someone faking your sending domain) or if it’s a change in 
delivery behavior (ie, Google dropped all the mail in the spam folder).

If it’s simply prefetch behavior, there’s nothing you can do. Google gonna 
Google.

I know these things are tricky. But: In the past years, we had at least 
consistent results with tracking pixels. I cannot validate the absolute 
numbers, but each campaign yielded roughly the same read rates (+/-10 %).

Best,
Mendel
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