On 5/21/26 12:00 PM, SecOps, Dev via mailop wrote:
Yes I understand all that. I'm just looking for a bit of clarity on the
triggers, let's say they have limits, no more than 10% increase in new
connections? 5?
I remember that I had a specific rule for @skynet.be, but it's not only
for @skynet.be but all mails hosted by proximus. In exim, I had to put
queue_smtp_domains = skynet.be
It might have been changed, bu that's how it used to work.
Knowing those, I would be able then to tune my relay to queue messages
accordingly.
On Thu, May 21, 2026 at 11:45 AM Laura Atkins <[email protected]
<mailto:[email protected]>> wrote:
Often connection limits are reputation based - known good senders
get higher connection allowances than unknown or known-poor senders.
This might be a good place to look at the number of connections
you’re making from your dedicated IP while getting that message. I’d
also look at the connections pooled over recent time periods. It’s
likely this is just part of the warmup process and you’re going to
have to finesse things for a few weeks during warmup.
laura
On 21 May 2026, at 10:27, SecOps, Dev via mailop
<[email protected] <mailto:[email protected]>> wrote:
We're in the process of moving out of AWS SES Shared pool, into a
dedicated IP, and we're trying to build up reputation slowly but
we're still hitting some sporadic rate-limiting responses like below:
421 #4.4.5 Too many connections from your host.
It would be great to know exactly what they expect so that we can
comply with the increase in volume.
On Thu, May 21, 2026 at 11:00 AM Bram Van Daele (Teneo BV)
<[email protected] <mailto:[email protected]>> wrote:
What specific SMTP responses are you getting from their border ?
Skynet is particularly picky when it comes to simultaneous
SMTP connections .____
__ __
*From:*mailop <[email protected] <mailto:mailop-
[email protected]>> *On Behalf Of *SecOps, Dev via mailop
*Sent:* Thursday, 21 May 2026 10:37
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [mailop] Transactional Email to Proximus'
scarlet.be <http://scarlet.be/> - How to provide proof of High
Volume Sender____
__ __
I'm sorry, I meant skynet.be <http://skynet.be/> ____
__ __
On Thu, May 21, 2026 at 9:57 AM SecOps, Dev <[email protected]
<mailto:[email protected]>> wrote:____
Hello List,____
__ __
This is my first email to the list. I'm wondering there's
if anyone here from Proximus managing the rate-limiting
queues of the /scarlet.be <http://scarlet.be/>/ domain
that could point me in the right direction. ____
__ __
I can reach off-list from my professional *.be* TLD domain
if that's a blocker. ____
__ __
Best Regards,____
__ __
TIA,____
__ __
[email protected] <mailto:[email protected]>____
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—
Demystifying “It Depends...” since 2001
Laura Atkins
Word to the Wise
[email protected] <mailto:[email protected]>
Delivery hints and commentary: http://www.wordtothewise.com/blog
<http://www.wordtothewise.com/blog>
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