On 2024-04-29 08:02, Mendel Kucharzeck via mailop wrote:
Hi,
During my last email campaign, I’ve encountered issues with gmail – and
after investigating this for a few days, I cannot make heads or tails of
the results. Maybe anyone can shed any light on what is happening.
Environment: Mailing list of around 150k subscribers, double opt-in.
Using AWS SES for around 10 years to deliver emails. DKIM, SPF, DMARC
and BIMI (with valid certificate) present. Custom MAIL-FROM domain set
up on AWS SES (newsletter.syniumsoftware.com
<http://newsletter.syniumsoftware.com>), sending mail address is
newslet...@syniumsoftware.com <mailto:newslet...@syniumsoftware.com>.
Sending pattern is irregular, I’m sending one newsletter every few months.
Timeline:
- A newsletter campaign on January, 18th was successful with high
read-rates. DMARC and BIMI were not present during this campaign, but
DKIM and SPF. MAIL FROM domain was amazonses.com
- Another newsletter campaign was send on March 15th, which was also
successful. DMARC was present, but set to „none" in order receive
reports. BIMI was absent. MAIL FROM domain was amazonses.com
<http://amazonses.com>
- The most recent campaign was send on April 26th with way lower (30-40%
lower) read-rates. DMARC and BIMI were present, DMARC was set to
„reject“. MAIL FROM domain was for the first time
newsletter.syniumsoftware.com <http://newsletter.syniumsoftware.com>
Commend you for updating your MAIL FROM, but you 'might' want to
consider having a URL redirect from newsletter.syniumsoftware.com ->
syniumsoftware.com, just for trust, transparency, and and confidence
factors.
(http://newsletter.syniumsoftware.com cannot be reached)
But this may be related to the drop in reputation of Amazon SES IP
Space. Do they offer a dedicated outgoing IP Address that you can try?
It also helps reduce any chance of forgeries.. Eg, smaller SPF
footprint, that could have poisoned your reputation.
Findings:
- DMARC reports received indicate that validation was successful most of
the time – the only problems were encountered when mail was forwarded
and SPF was invalid because of the forwards (~1-2% of all mails)
- No unusual bounce or complaint rate through AWS SES notification service
- Read-rates (measured using litmus.com <http://litmus.com>) and hits on
homepage were 30-40% lower than during past campaigns
- Unsubscribe rates were also 30-40% lower compared to past campaigns
- Our list contains around 40k subscribers using @gmail or @googlemail
addresses – yet we’ve received around 70k entries in the DMARC report
from google.com <http://google.com>. I know that you might use a
different domain for your gmail address, but a 30k difference seems
incredible strange. I’ve verified that we did not send any duplicate
emails using the AWS SES console.
- The google postmaster tools suddenly show a HUGE spike in rejects with
the reason „TempFail – Spam“. Yet, the spam rate shown in the postmaster
tools hover between 0 and 0,1% during this and the last campaigns (i.e.
no spike).
Questions:
- 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
Any insights or hints on how to investigate this would be highly
appreciated.
Thanks in advance.
Best,
Mendel
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