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Error 552 with mail settings for own domain address and external POP server?

nigelmercier
Grafter
Posts: 41
Thanks: 2
Registered: 11-01-2011

Error 552 with mail settings for own domain address and external POP server?

I have several domains registered, and currently use the mail servers from my host. There are two problems:
[1] Their spam protection is rubbish
[2] My outgoing mails from one domain are not getting to external addresses at the moment (they were fine).
I've created a mailbox on PlusNet and I've tried to set up Outlook so it uses this to send, and the current mailbox for receive (I will change this later).
Email Address: [me@mydomain]
SMTP Server: relay.plus.net
Outgoing Server Authentication: Log on using [my PlusNet mailbox username and password] (I can't use same settings as incoming mail server, obviously)
SMTP Port: 25
I'm getting a 552 error (message rejected for spam ...). I don't see why it reports this, as I have provided authentication.
Is this because I'm using an address on my domain as my return address, or because I'm using a different POP server, or something else? If it's because my return address is on my domain, then the plan is a non-starter and I will have to consider another ISP that allows this.