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I need some help with this one. Suddenly, Roadrunner (rr.com) is rejecting our e-mails. See below:
Reason: Remote host said: 421 4.7.1 - Connection refused - <x.x.x.x> - Too many concurrent connections ( <4> ) from source IP
I tried reducing Max Delivery Threads from 100 down to 50. This did not fix the issue.
I have tried to white list our organization with this Time Warner owned company, but they will not because the e-mails we send are "user-generated." What difference does that make? Only if we pay them some $$$ can we be white listed. These big companies think they are so secure and safe, yet they kill productivity.
So my questions are:
How can I throttle outgoing mail from one particular user account?
If that is not possible, can I set SmarterMail to connect to this particular server one message at a time?
Any help is greatly appreciated,