I am looking into this. I looks like we just have our TLS timeout set too strictly and we'll be expanding it today. Feel free to message me directly with any further issues or concerns regarding Postmark.
Thanks, Alex -- Alexander Burch ActiveCampaign / Senior Deliverability Engineer [email protected] 1 North Dearborn St Suite 500, Chicago IL, 60602 <https://www.facebook.com/activecampaign> <http://www.twitter.com/activecampaign> <https://www.linkedin.com/company/activecampaign-inc-> <https://plus.google.com/107063868317743606466> <https://www.activecampaign.com/sig/?u=aburch&c=1> On Wed, Jul 29, 2026 at 12:57 PM Brian Peterson via mailop < [email protected]> wrote: > We’re seeing PostMark issues as well (Started maybe June or May?). Two > separate members of ours, using two separate app vendors, both of which > seem to use Postmark. The only info I have third hand is “Timed Out waiting > 5s for response to cmd=STARTTLS”. I can’t seem to find any indication of > rejecte > > <https://login-usb.mimecast.com/u/login/?gta=apps&link=cybergraph-report/eyJhbGciOiJSU0EtT0FFUC0yNTYiLCJlbmMiOiJBMjU2R0NNIn0.XhSqLytfxFxq8Tj8XGX9PxF2DEDqm9O1nLFLLDCw1tBnZZ-twgCxhKpj4dPghETp4r5PEd9a98hYcOExcZaPlhWNMdjrYgNjZb03qyEksgks8BKDl27rYNMLI9DtAsWvNG19R5fcY90evgSKIRn6TgVOB08dBPCxBW36AdhpARv-Vajtvi-_ClDEIrU67VJK5EsAqCO7KT1LAgBDPwJ8oKx3Jd1M3Fbp1guUORhtvTtfOmCNbtquIaXFiXqJJs1kaxIad62cBaC6NeyyfOJ4cz6yajj0iUZap3Xblr6DxwoiIcUoOdcCao16KNZMg_aCVNH7c6u_YBreMlIbJiggtw.ZdmbQ_duVMfnISYd.U4oz5wefNUnOHooQtxQ3-ZGVb8fCcB2LtD-kAHF4L0YS0QvykIJgiZGJ6OSrNa9uzmh9asqP6Z4xLOjcMMhPPXuh8yIWo5qSR0CMD-O8UUefE16OYz2XAl3_-8b_t7gd2Bo2RTYoz330phF51UN_5KRannLqxNdYSyuf5HLcYWOyfnqWVUgxIA3Mii4LzY_ia-T5yaVWg29Nmid32HpyueRMUpd2gnOGNVJC3nOp3Zgqiw6aGgoEmNHsD5nPBUk0aR4S-fbqfJrlYnwRSFc2mA0yscc9o0E8jArtd3ZnRGn44hC4rXqzOZyLgmBsx2eTAB_3NLzc16DdYfrZhSeGbWS_8Q9Nt7H-MpEyY2gFUq8pjyU__aHsviE0y8B3yu52py5TJBYME_71hDnFzev9elrod3la9nxGrJcjCRXkInLS8x6Qh6ZS6GUPtsxnFkt5kfLOxhGa2nFWG9xYSid3dQCvJio.vRZV4AOXvFbFeQ7ALU73Tg> > CGBANNERINDICATOR > > We’re seeing PostMark issues as well (Started maybe June or May?). Two > separate members of ours, using two separate app vendors, both of which > seem to use Postmark. The only info I have third hand is “*Timed Out > waiting 5s for response to cmd=STARTTLS”. **I can’t seem to find any > indication of rejected connections from Postmark on my end. Firewall > logging also shows all traffic flows allowed for the items that DO make it > through.* > > > * Did you ever make any progress on your issue? Might these be related? > (May 22-24th also sticks out as to some sort of change made, but I’m not > sure if that was the app vendor or PostMark themselves.)* > > > > > > *From:* Scott Q. <[email protected]> > *Sent:* Wednesday, July 15, 2026 1:30 PM > *To:* [email protected] > *Subject:* [mailop] Issues receiving from Postmark > > > > If someone from Postmark is on the list..it seems we are having an issue > receiving e-mails from you. Only error customers report is: > > smtp;400 KumoMTA internal: failed to connect to any candidate hosts: > connect to 65.39.216.37:25 and read initial banner: reading banner: Error > Connection closed by peer reading response to cmd=NONE > > Sample e-mail: X-KumoRef: > eyJfQF8iOiJcXF8vIiwicmVjaXBpZW50IjoiY2hyaXNAaW5zdXJldGhlYm9hdC5jb20ifQ== > > You can message me off-list - thank you! > > Scott > _______________________________________________ > mailop mailing list > [email protected] > > https://list.mailop.org/listinfo/mailop > >
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