Joe,
Thanks for the response. It's most appreciated. Those logs have already
rolled off... I never changed the OpenBSD default for retention. Those
emails are getting sent out the first week of the month however. The
next round are coming up, so the logs can be inspected then.
I think the hangup is that I'm going from 1 outbound email every once in
a while to having 20ish being sent in a single session. It's tripping
some kind of anomaly detection with Google in particular.
I am using the Google postmaster tools. The compliance status for the
subject domains are all green. Spam is 0%. There's no data for the
feedback loop. The DKIM success rate is 100%. Encryption is 100%.
Delivery errors are 0. The only hint is in the logs.
I'll defer my question till the next round is sent out, so the log data
is in hand. Let me know if there are any other suggestions.
Thanks again,
--Bruce
On 10/28/25 02:56, Joe Cook wrote:
Hi Bruce
I do not have a direct answer to your question.
From what I read I doubt your mail history, I doubt it meets the
threshold of a bulk mailer for any of those systems.
I run a mail server that can queue a few thousand in a day. Think
"monthly invoicing".
Only once have I encountered email delays by gmail. It took a few days
to clear the queue.
My mail logs provided feedback from gmail on why it was being delayed.
Are you seeing anything in logs?
I was following email sender guidelines provided by gmail and it still
happened.
It may be worth reviewing any vendor guidelines to see how your system
matches up.
Utilizing gmail Postmaster Tools may help understand what gmail thinks
of your server :)
Cheers
Joe
On 28/10/2025 4:20 pm, Robert B. Carleton wrote:
I have an issue with email providers throttling receipt of outbound
mail from my MTA. Most of the time, it only handles my email, with
maybe 10 emails being sent outbound a week. All the usual SPF, DMARC,
and DKIM scaffolding is setup.
One of the sites I host is a non-profit with monthly meetings. There
are around 50 members. Once a month, a announcement email is sent out.
When it's sent out, it takes about a day for the queue to clear,
because the MTA is immediately throttled for sending multiple emails
per provider.
I tried setting "smtp limit max-mails" to various values, but I'm
still getting throttled. Most of the non-profit members have Google,
Yahoo, or outlook.com accounts. Does anyone have suggestions for
better settings? I'm running OpenBSD 7.8.
If the emails get sent out over a 24 hour period, that's no big deal.
I'm just trying to avoid getting marked as an excessive sender. I'd be
grateful for any suggestions.
TIA,
--Bruce
