> On May 1, 2019, at 2:51 PM, Chris Adams via mailop <mailop@mailop.org> wrote: > > I have customers that (unwisely) depend on sending email to SMS via the > @vtext.com gateway. Lately, the messages have been periodically backing > up in our queues because the Cloudmark SMTP servers reject the messages. > I get different error responses: > > 452 4.1.1 <num...@vtext.com> requested action aborted: try again later (in > reply to RCPT TO command)) > > 421 vzw-ibgw-5001a.stratus.cloudmark.com cmsmtp Connection refused - > LhYMh85jEL68J - POL109G - too many sessions from 76.164.172.160 > > Sometimes, the servers will accept messages for a short while, then > reject them for a while, then accept a few, etc. I looked to see if the > POL109G had a specific meaning, but just found references to others > getting that error. > > As far as I can tell, we don't have spam/garbage/etc. going out to the > @vtext.com numbers that would cause this (when I look at the messages in > the queue they all look legit). Is there anything I can do to improve > the delivery of these messages?
AIUI, no. They're not intended for bulk SMS delivery; your customer should cough up a little money and go with an SMS gateway. Cheers, Steve _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
