All our outbound mail servers have seen strange responses to messages to sprintpcs.com, vmobl.com, sms.myboostmobile.com and message.ting.com. They are delivered to postmark's spr-sms.mx.a.cloudfilter.net MX servers and frequently given a 250 with the message "ESMTP server not available". Our postfix servers assume that means delivered, but in testing we're finding that they are not actually arriving. We're estimating approximately 1/3rd of our messages to those domains are impacted. We do not see it on other domains using cloudfilter.net.
Example: Mar 5 16:07:20 mailout-i-008204 postfix/smtp[14802]: 9DF126126B: to=< 5555555...@messaging.sprintpcs.com>, relay=spr-sms.mx.a.cloudfilter.net[52.23.25.191]:25, delay=2.9, delays=0.05/0/0.44/2.4, dsn=2.0.0, status=sent (250 2.0.0 ESMTP server not available) Anyone know what is actually going on here? Seems like a conflicting response and I'm not sure what they want me to think about it. Thanks, Josiah Ritchie
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