This is an old thread but seems to be an ever present issue, at least for us.
Essentially, Yahoo just quits the connection after EHLO. This happens very often on certain IPs. The basic dialogue is below. Has anyone ever determined why Yahoo does this? Is it a reputation issue? Opening too many connections or sending to fast? It seems like historically Yahoo support has not been able to help with this if I'm reading correctly. What to do then? 2018-02-16 09:45:22 starting 2018-02-16 09:45:22 connecting from s1.asa1.acemsd4.com (192.92.97.137) to mta6.am0.yahoodns.net (98.136.101.117) 2018-02-16 09:45:22 connected from 192.92.97.137:47164 2018-02-16 09:45:22 >>> 220 mta4234.mail.gq1.yahoo.com ESMTP ready 2018-02-16 09:45:22 <<< EHLO s1.asa1.acemsd4.com 2018-02-16 09:45:22 >>> 250-mta4234.mail.gq1.yahoo.com 2018-02-16 09:45:22 >>> 250-PIPELINING 2018-02-16 09:45:22 >>> 250-SIZE 41943040 2018-02-16 09:45:22 >>> 250-8BITMIME 2018-02-16 09:45:22 >>> 250 STARTTLS 2018-02-16 09:45:22 <<< STARTTLS 2018-02-16 09:45:22 >>> 220 2.0.0 Start TLS 2018-02-16 09:45:22 tls:TLS*****************HA256 2018-02-16 09:45:22 tls:Cert: /C=U*******************Cert SH*******d=no 2018-02-16 09:45:22 <<< EHLO s1.asa1.acemsd4.com 2018-02-16 09:45:22 >>> 250-mta4234.mail.gq1.yahoo.com 2018-02-16 09:45:22 >>> 250-PIPELINING 2018-02-16 09:45:22 >>> 250-SIZE 41943040 2018-02-16 09:45:22 >>> 250 8BITMIME 2018-02-16 09:45:22 <<< QUIT 2018-02-16 09:45:22 >>> 221 2.0.0 Bye 2018-02-16 09:45:22 closed mta6.am0.yahoodns.net (98.136.101.117) in=256 out=68 2018-02-16 09:45:22 done Thanks, Alex Alex Burch ActiveCampaign / Deliverability Lead (800) 357-0402 abu...@activecampaign.com 1 N. Dearborn St., Chicago , Il 60602, United States <https://www.facebook.com/activecampaign> <http://www.twitter.com/activecampaign> <https://www.linkedin.com/company/activecampaign-inc->
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