I recommend not posting specific email addresses in forums since spammers will use them to send spam to. The message was blocked as spam. You can add the sender to your allow list to receive the emails.
QUOTE (JLRC @ Jul 29 2015, 08:54 AM)
A regular client that has emailed us for years is now having their messages to us blocked. Please see information below they have provided:
inbound.meetingsuk.com.netsolmail.net #<inbound.meetingsuk.com.netsolmail.net #5.7.1 smtp; 554 5.7.1 The message from (<firstname.lastname@example.org>) with the subject of (Leeds and Birmingham - I hope you get this - I'm still getting stuff bouncing back.) matches a profile the Internet community may consider spam. Please revise your message before resending.> #SMTP#
Their server address is mail.wavehealthcare.co.uk which has the IP address of 188.8.131.52. They relay mail out through Trend via relay.mx.trendmicro.eu