Definitely an issue with your provider, an IP or range of IP's that they use is being blocked and you're not going to be able to unblock it. If they're unwilling/unable to fix the issue something like mailchannels would work as @GOT suggested or you could host the mail remotely/elsewhere but it's the same concept.

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    Re: SMTP error: 550 Administrative prohibition. From: Uwe Dippel <[email protected]> Re: SMTP error: 550 Administrative prohibition. From: Haines Brown <[email protected]> Re: SMTP error: 550 Administrative prohibition. From: John Hasler <[email protected]> Prev by Date: Re: SMTP error: 550 Administrative prohibition

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    (in reply to RCPT TO > command)) Your Postfix relayed the msg to smtp.secureserver.net, which then returned "550 #5.1.0 Address rejected". Either you're sending to a non existent address, or there is some configuration problem at the remote MX. You'll need to contact the administrator of the remote system. 13/2/2018 · you need to check your account and port settings. Typically, you need to use SMTP port 587 for the Outgoing Server and encryption as TLS. Check the Outgoing server tab and set it to My Outgoing Server requires Authentication option.

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