Hi, as of this morning my outbound email (inbound still OK) has been blocked with the following message:
An error occurred while sending mail. The mail server responded:
554 5.7.1 Service unavailable; Client host [2.219.202.28] blocked using sbl.spamhaus.org; https://www.spamhaus.org/sbl/query/SBLCSS.
Please check the message recipient "[email removed]" and try again.
