So it seems a bit unclear to me, is it saying that part of Heart Internet's server (possibly their new mail provider, Soverin), is on Outlook's blocklist, or is it vice versa, i.e. part of Outlook's server is on Heart's server blocklist?The message says what your problem is: your server is on the block list (black list). You can only bypass this by using SMTP, because then the sending server is different from the blocked server.
Statistics: Posted by Innertraveller — Sat Mar 15, 2025 9:46 am