Email rejected as spam

[#1]

This afternoon I have two emails rejected as spam. They were just conversation emails to two friends who I normally email satisfactorily.  Other emails are getting through to other addresses.

The error message on each one was:

The mail system

<xy@123456789.plus.com>: host mx.avasin.plus.net[212.159.8.200] said: 552
    Spam Message Rejected  (in reply to end of DATA command)

Both people I emailed have addresses that end with .plus.com

Anyone any idea what might have caused the spam block?

[#2 · Accepted solution]

Hi there, could you drop me a PM along with your username please if that's still an issue. - Adam 

[#3]

Thanks and noted.  Block seems to have been lifted as an email has now got through. PM sent.

[#4]

I am having this exact problem, Plusnet are blocking some important emails probably thinking they are spam.

I have lost good business because of this-I think it has been going on for some time.

This is incoming emails as well as outgoing.

Help required ASAP please!.