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?
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]> 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]> > 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]> > 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]> *On Behalf Of *SecOps, Dev >> via mailop >> *Sent:* Thursday, 21 May 2026 10:37 >> *To:* [email protected] >> *Subject:* Re: [mailop] Transactional Email to Proximus' scarlet.be - >> How to provide proof of High Volume Sender >> >> >> >> I'm sorry, I meant skynet.be >> >> >> >> On Thu, May 21, 2026 at 9:57 AM SecOps, Dev <[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] >> >> -----BEGIN PGP PUBLIC KEY BLOCK----- >> >> mDMEag66CBYJKwYBBAHaRw8BAQdAMNVdlzezcwCNwLaa9fsc3Jh+X7rCDOyHphgD >> FICOMhK0MVNSRURldiBTZWNPcHMgKG1haWxpbmctbGlzdHMpIDxkZXZvcHNAZGl6 >> b3JnLm5ldD6IkwQTFgoAOxYhBPpHG9wc7t+sdIXWcXraqS6BSNNEBQJqDroIAhsD >> BQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheAAAoJEHraqS6BSNNEjRcBAPbEMYmZ >> 3gJpjk+3Roo1Ck5qjLFolQds3+0zQMXQgQ3QAQCO6AeBHPnKqvz4MArJfZODWras >> xft87BUm9wF+Q3OWArg4BGoOuggSCisGAQQBl1UBBQEBB0DI9NAzy+4PT28vFrsf >> wfDdujqMpL0yEmRcis3nUry6FQMBCAeIeAQYFgoAIBYhBPpHG9wc7t+sdIXWcXra >> qS6BSNNEBQJqDroIAhsMAAoJEHraqS6BSNNEQb4A/1mO9Qmu1mBzyI5OmPE0RIkP >> aKt/aG5EsWoLXTML3YyqAQDdAC0kzhAvN9jDSqCnxU8E6O9O7NXcaaHXMtbffyQu >> BQ== >> =phdp >> -----END PGP PUBLIC KEY BLOCK----- >> >> _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > > > — > Demystifying “It Depends...” since 2001 > > Laura Atkins > Word to the Wise > [email protected] > > Delivery hints and commentary: http://www.wordtothewise.com/blog > > > > > > >
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