When a Verizon mobile user sends a text to an email recipient, I understand it goes through some mail gateway system that converts the message to a standard email and I think uses the @vtext.com as the sending domain with some composition of obfuscated user data before the domain. We are receiving many reports of people getting "connection refused" errors when a Verizon user is sending with this method; see below for error message.
Is there anyone on the Verizon mail admin team we discuss/troubleshoot with please? Our receiving SMTP server is definitely not refusing connections so either tcp traffic is getting blocked before arriving to us or the wording of the error message is not accurate. But without knowing what all the sending IP addresses are for sure, it is difficult to even troubleshoot. We are attempting to run a packet capture on the IP addresses listed in the SPF record for vtext.com but that uses assumptions which may be incorrect. One example error from a Verizon user attempting to send: This is the mail system at host twbgohaavzwvmta-c-rh-cmta-01-sms-01.vtext.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <xxxxxxxxxx...@usinternet.com>: connect to smtp1-mke.securence.com[216.17.3.48]:25: Connection refused Thank you for any assistance! -- Justin Krejci Network Engineer 952.253.3200 12450 Wayzata Blvd. Suite 320 | Minnetonka, MN 55305 [1616694896307]
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